Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3eae36de325b18…

MALICIOUS

PDF

79.1 KB Created: 2021-02-26 12:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00578636414f79ce2cbd3acc5ee80857 SHA-1: 057729c366ead7d99c0c7a6c7cea323d133e58a4 SHA-256: dc3eae36de325b18a3e7257d3a1358249858201fa6be71075c5c746704d0ec5a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://fokemale.ru/123?utm_term=vizio+sound+bar+apple+tv+bluetooth PDF link annotation
    • http://maska-respirator.shop/mimirjevu6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_6015774ac0bb7.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/5_3_bank_mortgage_login.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/CjigiDI/bidavitula.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/h5ihbjc/kevavikamasamuxujexabatis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5ff30ebb11913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5ff93913dc0ad.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/12118114806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500911/normal_6006be3e7cb35.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/jiledenozenukego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://geforagegi.atwebpages.com/75469134208.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/6635086031.pdfIn PDF document text
    • http://vazuvipib.rf.gd/dipunibikimekufuwegoxo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 5264 bytes
SHA-256: 6f7e696514743c09d4a0747d260beb37e4e080c6daeac31eae4256dc55e9b97e
font_01_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 11220 bytes
SHA-256: 6c2c547b640d38c3f4bf7216a1ef04d49c4e1463d143da86f9fd40700d864060

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