Malicious PDF — malware analysis report

Static analysis result for SHA-256 d134b16ba30552d0…

MALICIOUS

PDF

89.5 KB Created: 2021-03-16 17:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3fc20386029db8956f3515320342f1e2 SHA-1: dcd958b61188e150715763c38da401b1e1d07cd5 SHA-256: d134b16ba30552d0371ac060709eebea9460b1c1ada2238f721c0b9612e2abb1
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, indicating it is likely a link farm designed to redirect users to malicious sites. The PDF structure and embedded URLs suggest an attempt to disguise malicious content as legitimate documents, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=brand+guidelines+example+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428033/normal_5ffd639d8e3ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_600f168269318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_601d951a28941.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5ffb0b67369bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_6045f9f96a9e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_60377f5931f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fd7565809ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6021d5c07901a.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/my_forbidden_face_sparknotes.pdfIn PDF document text
    • http://apsdd54gfv.xyz/281338057032r6zc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_601c76f10e761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5fe4ec62676cb.pdfIn PDF document text
    • http://metazoaapc.fun/204582146602hglx.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/lezut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_5fd92de6905c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_602749dc2c49d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://korobuvorudetiv.rf.gd/break_up_boss_app_android.pdfIn PDF document text
    • http://ditanumugagoma.myartsonline.com/puvemajiw.pdfIn PDF document text
    • http://fuxodenajakifut.epizy.com/happy_anniversary_wishes_song_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 5480 bytes
SHA-256: aef689c66781a7e27e88074becd1d84613fc7946d883cd7b8fad4c051d1a8100
font_01_sfnt_off00011b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B40 11872 bytes
SHA-256: edf855bf16647d4710b6c88a4d896b0a2b57bc5b7ea54dabf04c5dcb28a593f5
font_02_sfnt_off00014342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14342 16184 bytes
SHA-256: 89c208c5973a3c695bba959c66362a10f0c6c59a87e6967c78d3dea7ec8928c2

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