Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c00fdfe1f8d001…

MALICIOUS

PDF

76.7 KB Created: 2021-03-08 18:04:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 632d79bf9d66e205e96615f2538dd6d3 SHA-1: 9da3775a8cea70e7f1e04d054a93ba91ecef35e6 SHA-256: 90c00fdfe1f8d0015bec5111316764c1b815593e4b3affad9d5c9d49c86d80da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=infrastructure+as+code+kief+morris+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383156/normal_6024cca16e4f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5fec046457e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_6037fe49caf24.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/ramub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_60098f7ea2c32.pdfIn PDF document text
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/638aaac4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fca86f085a7d.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/80635611656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5fe8d4c25afe9.pdfIn PDF document text
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/d072e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487201/normal_5fee0f5ca6b21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ff2d4f5e8d69.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/8beed4c3d8e6c.pdfIn PDF document text
    • https://jakugogafezokev.weebly.com/uploads/1/3/1/4/131437362/4050860.pdfIn PDF document text
    • https://gepadagonuvo.weebly.com/uploads/1/3/0/7/130775626/f71e0b041fb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sibubixusa.epizy.com/what_force_holds_atoms_together_in_a_covalent_bond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3dbe005-eeaa-44a5-8c5d-2a73fc08dce5/58599909109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad55b5ff-407e-4689-bbce-b76ab0f4ee59/armitron_digital_watch_directions.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5268 bytes
SHA-256: 70a67ce7fda9314effee76a7d3c9b14fc4e4f5949d4404040ec838fcff055e0e
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10148 bytes
SHA-256: 7446b0b8ebb63013d36745618cad83c9a19d88a51859d931d3b73b9d4c4726ef