Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e7e7b7165d7d17…

MALICIOUS

PDF

71.0 KB Created: 2021-02-13 14:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7a6a49cd11026dcc993999eb30b48470 SHA-1: 75e6b5db8a43c70f5a251183d08e9c706a7e5f0f SHA-256: c1e7e7b7165d7d17466c8f3144e702bc8a904efb6c269365523c01802cde469d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with a primary suspicious URL pointing to 'baarspo.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of embedded URIs and the nature of the detection suggest it's likely used to redirect users to malicious sites.

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://baarspo.ru/wix?keyword=blood+hunter+5e+wikidot PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452594/normal_6023f78b5350d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369173/normal_5ff6588f95be5.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/msbjg9k/535873843.pdfIn PDF document text
    • http://vashastrahovka24.ru/11852042451l26vo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_5fd795e97ca8a.pdfIn PDF document text
    • http://meinekarten.best/kebupavanm4w68.pdfIn PDF document text
    • http://letxxnx.org/fipujirirozi6580a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5fe183d691077.pdfIn PDF document text
    • http://esagafow.fun/sonefev7l0.pdfIn PDF document text
    • http://effektzhizni.ru/gluten_and_dairy_free_birthday_cake_recipes_uk3e2u6.pdfIn PDF document text
    • http://immorta-cross1.club/sisters_of_mercy_songs_lyricszsqhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_60102f8e92a52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/82427212740.pdfIn PDF document text
    • http://fididebezewigex.epizy.com/meminamitodufiti.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/slow_loris_fact_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 4736 bytes
SHA-256: 0fb33460d9ba31347140071522720a7ddf24044ea260df451b51ac140c0aa521
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 9776 bytes
SHA-256: 2dca1beae53bdd671079f2207fcf03a42781c5c59b9c37d4717916c17ae41c38
font_02_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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