Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfda990fac030ff9…

MALICIOUS

PDF

66.7 KB Created: 2020-11-20 08:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c9e429b707b0fbe3c9fdc672422758a3 SHA-1: 18ccc856bff2217da3aee7a246641c4355c56168 SHA-256: bfda990fac030ff973a6fde0c187f31fea0516a5928e69bf1a1c52665cebe500
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign-looking PDFs, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is 'https://trafficel.ru/123?utm_term=alphonse+elric+cosplay', which is likely used to direct traffic to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://trafficel.ru/123?utm_term=alphonse+elric+cosplay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8fe4106bf15.pdfIn PDF document text
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/vonunuparib-nanovegojon-gomamijerawule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_5f993463ae706.pdfIn PDF document text
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/sedumaraninuj-jelijovejajipe.pdfIn PDF document text
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/sipixuzipiluje_dazumidaraz_fowofegivave.pdfIn PDF document text
    • https://zamizugupaf.weebly.com/uploads/1/3/3/9/133999186/9c6efc89cdb676.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://s3.amazonaws.com/jusuberu/wad_manager_wii_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6238c416-c1a2-480a-899a-9966b95f65b5/88390205157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbba5d3-77fe-43f2-b807-1cb830f37371/wepadivisewiderifubuf.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/3843659693.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/43827058182.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/weekly_calendar_with_time_slots.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_off0000bde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE3 4820 bytes
SHA-256: 5653c4de7d5efe90c5aa25869116a144d95e216631e99a1df00aaf198a09b145
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 10016 bytes
SHA-256: 830ba5a356451407cf9abb4315f7978c2d1fd0e159e2af5f6fb0ea42ae2bb79f
font_02_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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