Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c8507463e02e36…

MALICIOUS

PDF

80.1 KB Created: 2021-04-26 06:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 90a4d6aa02b0764e616e3c996d4cf1e7 SHA-1: e78d58ee3e262afdc32862cdf79722607b36e08a SHA-256: 37c8507463e02e361336f72fe0cf4e1346397d1c9939abda3aea63413213cf79
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to cleaning a Nespresso machine, which is a common tactic for phishing or malware distribution.

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://zajinet.ru/strik?utm_term=how+to+clean+a+vertuoline+nespresso+machine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366627/normal_6046701c22ad9.pdfIn PDF document text
    • http://bit7.top/65692599807epw6h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5feba56fe4c0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5fffe7f3c1d96.pdfIn PDF document text
    • http://prolac.ru/449877478579feli.pdfIn PDF document text
    • http://jisutuxoxaza.medianewsonline.com/nuferezajop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366040/normal_5fcbd5bee1bb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tesalivolanimeg.rf.gd/gugofiwoneperedeku.pdfIn PDF document text
    • http://veruzixiki.rf.gd/banezojuwub.pdfIn PDF document text
    • http://kunipotow.epizy.com/will_durant_story_of_civilization_complete_set.pdfIn PDF document text
    • http://nowotaresumoti.epizy.com/15534711969.pdfIn PDF document text
    • http://sanojepenot.onlinewebshop.net/59667294186.pdfIn PDF document text
    • http://vovugawe.rf.gd/pemifobi.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/jibinora.pdfIn PDF document text
    • http://savikolapuxol.rf.gd/kobewamigimapopulo.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/nespresso_capsules_guide.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/naretidosuwozegapamogupe.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_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 5288 bytes
SHA-256: 4928fbed47c942389d2294c7c8d366537c3208f4a758e4b59f4e43d4d2af0ce3
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 10788 bytes
SHA-256: 5e2b5b627dce56cc33a5c047afde387337c8e1f3e4f106b04ddefcb0e2a994f2

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