Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f52b33665544ff…

MALICIOUS

PDF

89.2 KB Created: 2021-05-29 21:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4bd78c82935631476b5a36b85a93f817 SHA-1: df7fcbb92ef3942f4713090895dbded29c8f20c9 SHA-256: e1f52b33665544ff7a8efb2eed8121199b7c6242995d3af531372af27e139831
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. One of the primary links, 'https://baarspo.ru/strik?utm_term=is+twilight+midnight+sun+coming+out', suggests a potential phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/strik?utm_term=is+twilight+midnight+sun+coming+out PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404753/normal_604666d6705a7.pdfIn PDF document text
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/pokoterimi_pulilamojikom_futesesejodo_vawexudujes.pdfIn PDF document text
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/guxafevasezes-wiluwa-wubox-xinowik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_6003606b94ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_602f934b95e6d.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/f9d108e273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_605146cb6d7d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fd108f9aa242.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/tumoralavus_ligikepow_lupofawaxex.pdfIn PDF document text
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/5045424.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/3067869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fe124ff9f55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_603eb1648df45.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/3231464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_60599e3c13966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_60628628032be.pdfIn PDF document text
    • https://tudanane.weebly.com/uploads/1/3/4/5/134596872/dosojabos-juronigoxar-lufuxiravamino-mogukinibutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd68ca374250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_6017c18b491d4.pdfIn PDF document text
    • https://wimupivirexov.weebly.com/uploads/1/3/4/9/134901171/ruwaza_sazifevif_tafavumipiguli_medulubigiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/246539a3-92b2-4e7a-9f17-ab3fb55e6888/19086897864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee0f8627-b524-43c3-90ed-1662f0b76a8c/wodopejatanovuxavudik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74160fc-8895-4dc6-a1d9-63bb31302b65/hp_p2035_printer_drivers_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c6548f9-721f-4153-8889-aa2c58ff067f/robinair_34788ni_wont_inject_oil.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 6872 bytes
SHA-256: 67e79166eab99d58c51b5605e0c69db1c2aa8670a9cd790b21b3c493144e1e5e
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 5076 bytes
SHA-256: 649516e749e71bd3e3f5469241ff142889ec17a5ef4ba0a553ca2a27de0fbe96
font_02_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 3896 bytes
SHA-256: 19cf9bfad1f9d03932a0843d26d8a1aeb454d475d51766457a355a44911fe9c4
font_03_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 11216 bytes
SHA-256: 4cd892610b5d9abac8af61ed061600cb0ccaa00a82bdf16bd819853248dcc51c
font_04_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 16288 bytes
SHA-256: 6855d70b61f5e9327f807f6bb52b2bcec790e495099dd50111bcb346fdc98262

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