Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc6b90a2dac9ead…

MALICIOUS

PDF

77.8 KB Created: 2021-02-21 00:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 46ba96cfd83f5e41f82adee03fae1946 SHA-1: 5ae268c6feefa9af3cc81913374c7e9567e008e4 SHA-256: abc6b90a2dac9eada3c2e5aa6c25f0dc847c2eff5f25b83b95823446929afcde
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to distribute malicious content or redirect users. 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 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://jacksth.ru/strik?utm_term=what+do+the+roman+flag+represent+in+a+compound PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488322/normal_600c94952a9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_601f3739a2544.pdfIn PDF document text
    • http://tur8osale.site/fishing_report_central_mngvdzl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_5fd1b58a7c0c9.pdfIn PDF document text
    • http://endi-itali.space/skull_wallpaper_for_phones88zvf.pdfIn PDF document text
    • http://atomyimperial.ru/324065037554kn3b.pdfIn PDF document text
    • http://zuvowizetigeko.22web.org/94904314684.pdfIn PDF document text
    • http://shoop-fh.ru/bts_answer_album_purchasedrvxo.pdfIn PDF document text
    • http://zalavsky.ru/6085455998538ar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5fdc35c024b24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382405/normal_6007c009ab112.pdfIn PDF document text
    • http://rrrrkkkkk.space/60955849073ti9ix.pdfIn PDF document text
    • http://instup.xyz/ukulele_jazz_chordsx3qio.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367665/normal_5fdcd4b0df4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_6015b9842f668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ffa60de9b3ef.pdfIn PDF document text
    • http://mabay.fun/nunubunibck07a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buposewalesuz.rf.gd/93754313678.pdfIn PDF document text
    • http://gagoxapedako.epizy.com/mexeluwetonar.pdfIn PDF document text
    • http://dowexibagodi.epizy.com/diccionario_de_filosofia_herder_descargar.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_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 5580 bytes
SHA-256: 9d8661f49aea7d823d27570edcb874b2ebb378629b54e45db3c45528db35eb9f
font_01_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 12460 bytes
SHA-256: 0ee575f0ba13a504b06c00bcd621c3ee8bccea903ba54c54542362828a5e0ff8

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