Malicious PDF — malware analysis report

Static analysis result for SHA-256 850eabcdcb66d2ec…

MALICIOUS

PDF

76.7 KB Created: 2021-03-06 11:01:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: baccd0e1cb6b3a791ee49913ed9bc72d SHA-1: d94cd24f3b9093cceb0c92a5ae945cfffd9085c0 SHA-256: 850eabcdcb66d2ec5bb503902c7ceeb9dd6041ecee0b1a8593470e351be40b96
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=how+much+do+chick+fil+a+managers+make+in+california PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5ffc946823021.pdfIn PDF document text
    • https://cdn.sqhk.co/kizusuvut/cRpYJie/20197014774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_602834787f852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_602c914f7e66e.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/iNihghb/konidajelusoruzebelex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5fec25495991f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fd094e929bff.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/5Pjjhim/wenudovulinejorexonixe.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/jh5Pc4L/game_anger_of_stick_3_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_8c71e165eae54d318fe4f050b1b481da.pdf?index=trueIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_4d8086e8baf940efb45d9c31a6c76e40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/gomenulixejadix.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_d4dab96b0f5c4f54995f8921108f3ad7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patilawasu/fadevene.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_12bb90cacf354994a468e0faf57484c9.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_c734de7e623a4b3d877e43e1b7e8b6cf.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_0bca0bc1d2104bb2843f70330c7d8e30.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_56a7144288bb46d393650df4b1c56a46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/78855236969.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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 5552 bytes
SHA-256: 6322485b9112e1a0e97ada92dc5e64d796cecb0dd0ec2bc917f941257bf242a7
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 10412 bytes
SHA-256: 8e897fd543d705ee83efd2ecbe3e96ef852e0eac2375d32684634e38d948744c

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