Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60dafa43b8d53e2…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 23:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d31d24e34d2339680fcaf1e6683c5af8 SHA-1: 54550b73a290dbc1a91c588fdaa642dfddce1cc2 SHA-256: a60dafa43b8d53e2bdf0f237cb743230f594488f6dae153609423ecd7b3f49d5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+cook+rice+on+power+pressure+cooker+xl PDF link annotation
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/xazulotame.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378410/normal_6005c14139b98.pdfIn PDF document text
    • https://fufopijubotuxo.weebly.com/uploads/1/3/1/3/131381544/7634262.pdfIn PDF document text
    • http://russianpatentexpert.com/86427849079ap07n.pdfIn PDF document text
    • https://vezinamitin.weebly.com/uploads/1/3/5/9/135984824/5979460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_604692b3e0090.pdfIn PDF document text
    • https://pegitizikaze.weebly.com/uploads/1/3/4/7/134730703/1916646.pdfIn PDF document text
    • http://woodlesenka.ru/troy_bilt_3100_psi_pressure_washer_hondafehr1.pdfIn PDF document text
    • http://domen3.club/what_is_suffix_ly_mean7h9pm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_603922b7deba2.pdfIn PDF document text
    • http://meblik.su/mewubeiqnez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1845051-61a0-43d0-9298-31a6a1e6aabd.filesusr.com/ugd/9c43ec_9ee667dadbe84d1bae668e727aa07d05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c93a0f9-7db6-48c6-8c68-7e9d705b4bf7/warhammer_40k_dd_campaign.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_328e6aa0bc8b41ffb619602290468469.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b03a35-d2b1-4a5c-863c-15b7e0d6f31e/33354417141.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_e512758b51ce431398d3eb48ff5e08ef.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_8a4045266ea84ca9a07c0eba56a9df9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/887e66c1-0059-4a96-92f5-1e93d3610ad7/accredited_online_anatomy_and_physiology_course_with_lab_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5bdf66-ee55-49b6-bf51-c441aace9ab0/rekapegijodukep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb919cd7-ec6f-4478-97f8-5734cf583436/amar_chitra_katha_books_in_hindi.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_dddd4c1de58e4f6cbb4e25acb5999f97.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_43540aa49c074771b526f44c44f13b24.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_1d5d64e992504ae2825629ac5c17b3e0.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 4904 bytes
SHA-256: 01f0714d69812ddcdc8d2b4aa85639d942af0e76f7d7a52276dba1a201449f19
font_01_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 10868 bytes
SHA-256: 5b298cede8f454a03d7fdd842c7a5074355b729303da28a531f4f79cf4b52d51