Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8fc1836c3e65ac…

MALICIOUS

PDF

77.8 KB Created: 2021-03-21 22:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9ad32c5cb337e3e17a527483a3452dd SHA-1: b7330a0abd4bfcf0f96348f6c0b2d7692978bb83 SHA-256: 3a8fc1836c3e65ac5474092f14e305d4ef5075b41e30065466623aba02652399
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not directly visible in the provided body text, is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=blackjack+pizza+near+me+greeley+co
    • https://cdn.sqhk.co/lejukujegomi/hdRhegf/word_worm_puzzle.pdf
    • http://bigtittybella.com/22762628769d5z59.pdf
    • https://cdn.sqhk.co/zujubiviv/hcihBia/amazon_kindle_unlimited_free.pdf
    • http://gagarinski.su/97067783466mnh2d.pdf
    • https://lokawinopigu.weebly.com/uploads/1/3/2/7/132712062/dixapakaj.pdf
    • https://cdn-cms.f-static.net/uploads/4494430/normal_6038260ad3273.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_6045130c3ed45.pdf
    • http://moscow-siberian-force.online/86933654850fi7jg.pdf
    • https://cdn.sqhk.co/zizaratijiga/jcDfjgl/gubidubomudone.pdf
    • http://bristol-yalta.run/informacion_sobre_los_billetes_de_costa_ricag60nx.pdf
    • https://mumasibomogavap.weebly.com/uploads/1/3/1/0/131070301/7187509.pdf
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/7681cde.pdf
    • http://santand-es.com/xanevigokexarupit1mp82.pdf
    • https://cdn-cms.f-static.net/uploads/4372735/normal_602d2c46b7e93.pdf
    • https://cdn-cms.f-static.net/uploads/4366964/normal_6032c42f6aa96.pdf
    • https://cdn-cms.f-static.net/uploads/4482405/normal_600a77ebd4f73.pdf
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/dusus_vipujizaxalewe_lituzadon_tutuvujuwo.pdf
    • https://minawitagolufu.weebly.com/uploads/1/3/5/3/135312922/6293636.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_602c47f63e78e.pdf
    • https://cdn-cms.f-static.net/uploads/4389354/normal_602b7598ca8c3.pdf
    • https://xifisipur.weebly.com/uploads/1/3/1/0/131069870/xezafuwa_padudaditefemig_ropeneg_potujis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f251.bin
dc4fc545b5b662ad2360488b81f550793042e3d0be9672760b7b943f03932286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 5416 bytes
font_01_sfnt_off000104c3.bin
37f4a04e31b6da43b2909925e28ff2f1e86ac3155f299b79f0208a7dea14abec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 10800 bytes

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