Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b8a1f35a1707ec…

MALICIOUS

PDF

72.9 KB Created: 2021-03-26 06:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a0dc5071aaaeb2cc82d8b752f37422f2 SHA-1: 8a29deca6297aca9f53f0117e21d91d9605e7949 SHA-256: c2b8a1f35a1707ec98923eedfe4f72749e4d71cd81aaff6914d909fc482e5751
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, suggesting a coordinated effort to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/123?utm_term=benign+paroxysmal+positional+vertigo+treatment+pdf PDF link annotation
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/gikegivavebasevu.pdfIn PDF document text
    • https://wetegawufuju.weebly.com/uploads/1/3/5/3/135302163/8825971.pdfIn PDF document text
    • http://jafebidit.getenjoyment.net/bamboo_steamer_recipes.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/cracking_the_millionaire_code.pdfIn PDF document text
    • http://kozlo.space/15455086190mbuz9.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/77574086294.pdfIn PDF document text
    • http://begetus11ppz.xyz/gate_civil_engineering_books_free_downloadkhzqo.pdfIn PDF document text
    • http://vilopeg.xyz/surafesalizigotejwr7n2.pdfIn PDF document text
    • http://cardio-active.site/accelerated_learning_techniques_for_students9m8dq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376087/normal_5fccfb253e317.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/ladurogowafaro.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/business_model_you_tim_clark.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/lenesejeda-zavafojifizaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388272/normal_60090ef21cad1.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/7b32a5f32f4bc6.pdfIn PDF document text
    • http://the-english-temple.com/kiragejedadutobuvisatzqk4n.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/wefowosukojudorob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kavezusi.onlinewebshop.net/gumeb.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/how_to_read_lexicon_ethics_for_upsc.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/71316343054.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 5640 bytes
SHA-256: 55788862e6c9698d53d178d3d7b7ea561513961e4f00c45b3e087ba4b7278848
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10336 bytes
SHA-256: 61e47ccf818dd0224f33217d4df959ae8c9f7de7dd2dd8b19da4b3014ab82573

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