Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b1edcf7833b76a…

MALICIOUS

PDF

84.2 KB Created: 2021-03-22 11:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ad171e2c77026612d2ef9612d4ee756d SHA-1: 65acee1884c0a525f674ffeb49de2bde4baad865 SHA-256: b7b1edcf7833b76ad940f9871869fff6a2b0d1f3836ee95e317bfbde589c989d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/aws?utm_term=suddenlink+tivo+remote+codes+for+samsung+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371508/normal_60163af508dff.pdfIn PDF document text
    • https://defasoxajex.weebly.com/uploads/1/3/1/4/131405962/60c406bd57ce6ca.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/senamubuwivib_jelolonizuba_bokolalozamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_604d2e6a581de.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/etAQzjd/52330476096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_603fa03e96046.pdfIn PDF document text
    • https://cdn.sqhk.co/mitajaso/cb8izge/discord_music_bot_rythm_2.pdfIn PDF document text
    • http://dukipor.iblogger.org/academic_performance_of_college_students.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/Tj0CFoa/movie_sisters_of_house_black.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481154/normal_5feedfd45c2fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_6015684962de6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417418/normal_5fed1809f2038.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/1ggQSP3/best_pencil_box_for_school.pdfIn PDF document text
    • https://regisaralox.weebly.com/uploads/1/3/2/6/132681556/rijaka-vakutugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_604fd9c0e0e24.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotilumezimak.rf.gd/cadena_alimenticia_de_los_animales.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_7a7daf76756947638182d0883d95090c.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_4905995dfabd4712b4ccfbacf3676d39.pdf?index=trueIn PDF document text
    • http://pafiduwujiredom.epizy.com/wuzirofomabum.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_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 5568 bytes
SHA-256: 6f42721ea43f747a57a53a1757d9e16ed8b6c2d2e3837fa796458ff934fd08bc
font_01_sfnt_off00011c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C11 11088 bytes
SHA-256: 0ba69d24c36cb206d3185ad6be3c9b92e420dc393c096fc57982a9001d8fa0c9

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