Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e6dc38af54bd0a…

MALICIOUS

PDF

81.8 KB Created: 2021-02-27 16:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2f5e27eb188f5ea843d119f6252bcf27 SHA-1: a04e5e413aaec5f1224b1bca0c9129f6425a62dd SHA-256: f6e6dc38af54bd0a98216154dcbfb2043cfc4b8c0e1e64209e4d668532c89741
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document's purpose appears to be directing users to a network of potentially malicious or SEO-manipulated external PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/award?keyword=best+convection+microwave+oven+in+india+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388169/normal_601105ffbf12f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5fcdb32150cb7.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/does_osha_require_employers_to_pay_for_hard_hats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487663/normal_602da439e9cad.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/1753256.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/31718672230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5fe783a24d247.pdfIn PDF document text
    • http://bestrongbyg.com/autotask_apiduzo2.pdfIn PDF document text
    • http://formblckr1.xyz/80512977246pkm7m.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/hheEiht/color_touch_effect_in_android_imageview.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/Kgdwahc/power_rangers_all_stars_gameplay.pdfIn PDF document text
    • http://sfhgfje5df.xyz/nobelelbnz9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_602b7cc750694.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/hjcifih/join_asgardia_space_nation.pdfIn PDF document text
    • https://cdn.sqhk.co/penutizufib/iX7ghIK/victory_day_ww2_veteran.pdfIn PDF document text
    • http://mixit.info/bumisisujunub1o9z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_6023caf4b567d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 5564 bytes
SHA-256: 318fbf9e6e0cc5de205b2d03c85f5551e187886434a34d03ba5d6893fcdc9487
font_01_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 10240 bytes
SHA-256: 455cf15e16e0b48a278100585c671c2538e43fe3412a3b914d817a6e7380783d
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 16120 bytes
SHA-256: b8fa99db91b4e2a38fb01ca4f8dfd1970d271bfdaf7323161a8b02e369b8fc98
font_03_sfnt_off00012b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B55 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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