Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa7bf6cb24a14df…

MALICIOUS

PDF

102.0 KB Created: 2021-03-14 05:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a437a8fb07fc1ba852c73c3d3ad3cac SHA-1: c86862e6454569cf309e9d4236c38485a87f7207 SHA-256: 6fa7bf6cb24a14dfd2cbcc781d7584cead3163a561d3909cd924c10e5b8cd617
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. ClamAV and ML classifiers also flagged the file as malicious, likely due to its structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/wix?keyword=eldritch+scoundrel+guide PDF link annotation
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/noxojope_lirojipod_wuvel_nugaligojol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600cf7f685c7e.pdfIn PDF document text
    • http://vakekaninu.iblogger.org/2029244324.pdfIn PDF document text
    • http://mobukonenila.22web.org/design_patterns_in_javascript.pdfIn PDF document text
    • https://pajatekudox.weebly.com/uploads/1/3/1/0/131069898/naxujumaxa.pdfIn PDF document text
    • https://nupebovewurezo.weebly.com/uploads/1/3/2/7/132710783/11a0e06.pdfIn PDF document text
    • http://tepuragebu.iblogger.org/wibajegubapiz.pdfIn PDF document text
    • http://girizug.22web.org/xejibaditajojigamafesox.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/jelulumuxijoboperav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_602ec3c66dcfc.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/9089445.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/karal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_600b568978a1a.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/lujojedogorelekagaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwozonez.epizy.com/95763040510.pdfIn PDF document text
    • http://fofifalog.rf.gd/poraxixisofaxagexad.pdfIn PDF document text
    • http://ravizovagusemav.epizy.com/auntie_anne_s_job_application_form.pdfIn PDF document text
    • http://faligesiba.rf.gd/adjective_suffixes_exercises.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/daggerfall_strategy_guide.pdfIn PDF document text
    • http://fewulagoxifi.epizy.com/bavixezim.pdfIn PDF document text
    • http://tazevisizi.rf.gd/44166797411.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_off0001525e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525E 4948 bytes
SHA-256: 5274458491c79e1c05df60bbd4ff0f762a6fc938bc8995163aeaa8d8b82f7242
font_01_sfnt_off0001632e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632E 11236 bytes
SHA-256: a9f38c6a7bb9db1a2b74bccd7b3295710ae5b8bad3c57e39976fbfac3dea0f4f

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