Malicious PDF — malware analysis report

Static analysis result for SHA-256 f496d8d3c4770d89…

MALICIOUS

PDF

75.1 KB Created: 2021-01-08 15:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c3179fd70f178bc2df1d5f11d2630b86 SHA-1: 3a8d3f2cd5707f1a4e518458a28fda6f0f8dbc29 SHA-256: f496d8d3c4770d8979ddac8c05f9a1c915c1aa1b3f0e532f6fe4013f5706ea00
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

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://trafffe.ru/123?utm_term=faceing+math+lesson+3+solving+one+step+equations+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393044/normal_5faaf8e33e910.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/ja7Nmhb/basketball_championship_rings_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f99e178ea96d.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/fAhfhgw/private_browser_download_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5ff027e4c7d79.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/xbyih6Y/gexadajodato.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450734/normal_5fc7dbfc78b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_5fe9e1dc248e0.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/gc3gjD7/funny_movies_to_watch_with_friends_on_netflix.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/subafubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5fbf4c8c479be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f9a33b2e7386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 5744 bytes
SHA-256: 03e3ac62e4647fc3780a74b28925a9c89779b04aab09ebf05be25e2de5fa1927
font_01_sfnt_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 12032 bytes
SHA-256: f3998e9be48c5083111387625fa981b0892966574b7d56b596df2f041e55f690

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