Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54e70df3b0cda9b…

MALICIOUS

PDF

73.3 KB Created: 2021-03-25 15:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f9264f2c45845fe80e174989bef72d4b SHA-1: 25cc54219536c66e9847f49820d4feeef7667070 SHA-256: c54e70df3b0cda9b272ce977355323653752e5d9351be41cbee3f612168e5d9e
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains a large number of external links, with the primary one pointing to a suspicious domain. The PDF also exhibits characteristics of a link farm, suggesting its purpose is to redirect users to a network of other documents, likely for SEO manipulation or ad revenue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xajibur.ru/123?utm_term=adjectives+exercises+pdf+with+answers PDF link annotation
    • http://getyourcredit.info/berger_load_data_260_remxx81u.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/classical_conditioning_theory_in_classroom.pdfIn PDF document text
    • http://getyourcredit.info/66168925509vabww.pdfIn PDF document text
    • http://leoidet.xyz/fejikisurikimimvwavl.pdfIn PDF document text
    • http://3-bureaureport.info/gesotolifizudtkl1j.pdfIn PDF document text
    • http://laxetatisitu.iblogger.org/41479875252.pdfIn PDF document text
    • http://trells.space/8508696847nf2bh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedesowul/uniaxial_crystals.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/kannada_badmaash_film.pdfIn PDF document text
    • http://nakirere.rf.gd/what_are_the_elements_of_script_writing.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_4f9f1adcb998452a9102e380bb107f1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/litunux/kenufozuju.pdfIn PDF document text
    • http://nazopagoja.epizy.com/ramebifevarofoxojotusevu.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/asbestos_roof_sheets_are_they_dangerous.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/noduridu.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_a0ba7205e052479f8e25cd4430e43b35.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_b99b9d56e9fb40b696e8fb8961cbdf52.pdf?index=trueIn PDF document text
    • http://rolubumemetujin.atwebpages.com/winters_bone_parental_review.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/chrisette_michele_couple_of_forevers_mp4.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_3e579120695743459903902148028a62.pdf?index=trueIn PDF document text
    • https://6ee404cc-7d2b-4f04-b730-bf74f4ee0091.filesusr.com/ugd/e5a943_ccd24514853e4d94b5f08622d8f70561.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 5496 bytes
SHA-256: 4128f00f1749425d020038ba9967cc9d6315072543e80093a966f76156e13e66
font_01_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 10476 bytes
SHA-256: 8e11cdebde820b74577be3a458b7a66aeae090043ce4d5cae1550c80e661b8f8

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