Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa42cf8b55049870…

MALICIOUS

PDF

68.6 KB Created: 2020-11-23 12:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c1eb5864f3e38e2745b0c6ee31d0f286 SHA-1: dd137a73a215603cfa1de9de3c59402c5df6aece SHA-256: aa42cf8b5504987017dec263744a4dea81f1899102bfa9e2485a03bdcdfcd46f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9978

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=game+of+thrones+cosplay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463809/normal_5fa89425f2fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_5fa37c1d3441e.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/mutukibof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b2bf8aa9-8178-433a-92c4-d1bf36067264/samudopirinuzunopujapulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4436bcf0-9763-4a0a-b7d1-8aec8917408c/northeast_georgia_resa_winterville_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b475650f-7f04-41d4-9ee3-7f37314d8dd9/14196952424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409ac0c2-c0d7-477e-8a31-873284ad011a/gaxomeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dab2e81-5693-4fef-83ef-e14a83b75a46/62277318915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8782a3d8-78ef-4e6d-aa67-3ee637723873/medial_s_words_mommy_speech_therapy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A6 5128 bytes
SHA-256: c2a52df5127f40fa0183a73ac92b3b276cb06e3fdf3ba74ecfaf5d4c8c650b61
font_01_sfnt_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 10912 bytes
SHA-256: d376489aacd59122b216474db38eafd71e4f1f635d13a176620ef93dd266d5e8
font_02_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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