Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58a7047f030bd9f…

MALICIOUS

PDF

75.1 KB Created: 2021-02-25 22:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c9f5c9a449da24dc68c8a93fd18cd73a SHA-1: e9e62a9348af2fba02248c6b7213fa02fe7650d4 SHA-256: a58a7047f030bd9ffa4db0d9977d7e679c4c12fba23846377bd78ad4759e0008
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs further supports a phishing or malware distribution campaign.

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://crophysi.ru/strik?utm_term=27001+iso+2013+controls+pdf PDF link annotation
    • https://cdn.sqhk.co/mezutorixo/tZhimha/45489016696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fd13be456a7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_601aa55f5ff24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5ff712e4212d6.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/danizerur_kaxigenefebu_dasin_kovemepunufafum.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/reading_the_bible_in_120_days.pdfIn PDF document text
    • https://cdn.sqhk.co/bovavadas/GDJic35/juger.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_6034cc56e4956.pdfIn PDF document text
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/5156227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_601e032c822f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499995/normal_5ff86380c3d01.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/84837724446.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/Lifgcfc/sstar_fall_river_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/AB5ibmA/6061560093.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/fisisazidukawufola.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/0cf7df25e7b4d9.pdfIn PDF document text
    • https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/nixabutofodurafuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_6031662455eaf.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/alesis_dm6_drum_set.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 5412 bytes
SHA-256: 40ca920ded9a994418065c83d7abbdbb2c10294d26baa9f849a03135f102fe77
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 10348 bytes
SHA-256: 92c089c4c577731c1918062f2ce3e9e96136849468fc3bfb5b8d80473329468d

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