Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea9ca01ce6282c9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-11 15:35:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 84e90a7dc698aef01f5448e92898f54a SHA-1: 76533ed4e612216535d117f89c691e5307ba399b SHA-256: 4ea9ca01ce6282c9b7b76bac2e2bcc2032babf93c44daea9b4c0d3a3f3815d91
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents, suggesting a tactic to manipulate search engine results or distribute further payloads. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=agriculture+durable+au+maroc+pdf PDF link annotation
    • https://cdn.sqhk.co/majumoros/XhhOl2m/83019772005.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/soroxulumiruxukus.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/Ejh3lfr/75351311932.pdfIn PDF document text
    • http://tipines.iblogger.org/another_name_for_visual_appeal.pdfIn PDF document text
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/9304890.pdfIn PDF document text
    • http://vogatamojaz.22web.org/xemazepi.pdfIn PDF document text
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/kefok-ketoxaken-xubitufazijum-pinivuxixuvepof.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/pafafosewugotatinibej.pdfIn PDF document text
    • https://zedurobarudavur.weebly.com/uploads/1/3/4/0/134018347/7604280.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/ib2giNj/business_administration_major_courses.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/practical_machine_learning_tools_and_techniques.pdfIn PDF document text
    • http://womebaziwime.iblogger.org/how_to_increase_transfer_speed.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/ibFiaaH/press_your_luck_elizabeth_banks_cancelled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_d8b690a86b8341d9b9ee98f37bf8f372.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_b0fb6984f5a54fd486285309e68162b8.pdf?index=trueIn PDF document text
    • http://vipovavediv.rf.gd/4588615501.pdfIn PDF document text
    • http://sirovorisolilu.rf.gd/nfl_personal_conduct_policy_2018.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/5680027010.pdfIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_8b64ca4de6954c40a391a137b19fcf31.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_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 5428 bytes
SHA-256: b2eafee2413ffabb242b704723459dbfd082fb49afe1b15650f28fced784c920
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 10744 bytes
SHA-256: f767d096f51b51f93d3d343f324940555c9040439ab556f49c6ad54d772c901d

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