Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f6c98933bdd4bd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-15 12:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 07c54b6ea2cf266c421a510553a63205 SHA-1: e58e06e51507f018d9659d8565fc2dab6208939c SHA-256: a9f6c98933bdd4bd62169aabc68c3866c8464ede2606671cba00e9c4c1eaec01
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, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to product maintenance, directing users to a URL that likely hosts a malicious payload or phishing page. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://jacksth.ru/strik?utm_term=how+to+clean+braun+shaver+cleaner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4497344/normal_5fc98be8a52bb.pdfIn PDF document text
    • http://titoto.xyz/siglos_karaoke_professional_crack7ci1h.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/what_is_minn_kota_i_pilot_link.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/cd2cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_5fd10cb290edb.pdfIn PDF document text
    • http://mon-cmbretagne.com/389352228190epsq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5ff452f1d1740.pdfIn PDF document text
    • https://bipozoxadedisaj.weebly.com/uploads/1/3/1/1/131164124/xadaposorij-wasokuwi.pdfIn PDF document text
    • http://pogadai.xyz/9971691409u0yt0.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/kebetunepelupamav.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/hjgQFAm/mokojagida.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/hiNyhih/58193266640.pdfIn PDF document text
    • http://pressit.fun/xfinity_xfi_app_issues7bpz4.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/gegemibejup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_4a86acc40011430ab37d33afba80d4ff.pdf?index=trueIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_fd302cc4c1f440b5a723dae09649a835.pdf?index=trueIn 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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 5140 bytes
SHA-256: d1085ab3f03a49d5271b71b3d916954dd46843b0ade6707bd8fc2dfc6a0f7a17
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 11468 bytes
SHA-256: 7bb147ec4da7e0045e5a93b7a0fb95c3b469186634014e021406cbac0689e529

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