Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf856973db5c9bb…

MALICIOUS

PDF

77.7 KB Created: 2021-03-31 22:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 898eac5a1ce7d9c2e9dfc34661ef8870 SHA-1: 224f7fb59d8392b711bee944d883bd20f154fe4c SHA-256: bcf856973db5c9bb7c9aeb3a9bc680c8bc7c235859adb4bd7af936e2a7c79b52
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 0.9993

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://lozipotod.ru/award?keyword=proses+terjadinya+aterosklerosis+pdf PDF link annotation
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/5240077.pdfIn PDF document text
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/dorudeki.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/bd3Gggw/juxogenam.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/290c5694de8da9.pdfIn PDF document text
    • https://cdn.sqhk.co/xizefonuma/DTm3ih5/87711572292.pdfIn PDF document text
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/4916290.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/hchfYwS/most_popular_tiktok_songs_november_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_6a81d96aad0f4598a5d5e4b6e11284f7.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_81c40b95c3c74b959b78595422241903.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_7c53d7cabd564b2a8527877610b7ddfa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/wumomuwix.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/jejelatolamanuziret.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/15363894417.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_2cb2ca3ab83247419a6e79f10922d2f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/guitar_neck_jig_template.pdfIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_9ffdda10172b4d759886362cc640b8ea.pdf?index=trueIn PDF document text
    • https://949217f6-ecfc-4a1b-8806-967b2a145102.filesusr.com/ugd/b08fd2_40c227cf4ef24399926aaad44c983cfd.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_1a20637830ac47e282a0e310d8260da4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarajix/42413951597.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_47657c7dd2d9456990ecae92ac1f2a4f.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_98c6e396ed8f4e9a97ff775dbdae516a.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_fb955ded41e24755bddce620d2e3e93d.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_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 5280 bytes
SHA-256: 24b0497995b44125d8fa46e3b3bc6cff76ceebfbfebcea0294d67e4b601d99d0
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10656 bytes
SHA-256: e6085cee7c366ff648df096c21401509a050d69902cd315978ecf1a1b04e91ca

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