Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca625203f0b375c…

MALICIOUS

PDF

72.4 KB Created: 2021-02-21 06:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa0622fa0e12a76917d0460c519f80ac SHA-1: 390f6ac545b6947398a389d248b28687211359e8 SHA-256: 3ca625203f0b375c0a56452cc9dcd9bdd526368cf3d8a1fd948c7b44872f9dd8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO link farming or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=harry+potter+4+pdf+archive
    • https://static.s123-cdn-static.com/uploads/4378153/normal_6006d40117149.pdf
    • https://static.s123-cdn-static.com/uploads/4463308/normal_5ff781f287a9f.pdf
    • http://soldonlakewood.com/features_of_a_newspaper_worksheetljawf.pdf
    • https://cdn.sqhk.co/risenulowo/fUwsjjR/63870949772.pdf
    • http://greenbike.shop/cdc_handwashing_guidelines_2018ip0db.pdf
    • https://static.s123-cdn-static.com/uploads/4486190/normal_60098199defb4.pdf
    • https://cdn-cms.f-static.net/uploads/4476133/normal_600eecc2a9d43.pdf
    • https://static.s123-cdn-static.com/uploads/4471095/normal_6008b83a57b39.pdf
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5fc8adabefbf3.pdf
    • http://asia.kiwi/nodulo_de_parotidanobqp.pdf
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/1475282.pdf
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5fe671b08a87a.pdf
    • https://cdn.sqhk.co/tatidukigag/2mqgehc/image_editor_mac_default.pdf
    • https://cdn.sqhk.co/xivomojuf/hygdZgc/4_pic_1_word_5_letters_fire.pdf
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/lusugorixuxu.pdf
    • http://com-signto6.xyz/89822451813mhrz2.pdf
    • https://cdn.sqhk.co/bogovureg/eyOjhgd/zombie_mob_sniper_3d_apk_download.pdf
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5fe105ae35088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xigilozixorod.epizy.com/data_retention_policy_template_gdpr.pdf
    • http://watosoxugulufi.epizy.com/capitalism_free_full_game.pdf
    • http://xilagerezob.epizy.com/wedding_invitation_cards_templates.pdf
    • 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_off0000de9a.bin
c33a8d87b6a5d4a72ed757d9b13060e3bbd3dea224bc9b01cdfaa58d3f88c23e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 5244 bytes
font_01_sfnt_off0000f084.bin
2a6a9193a5060f2b665dd3f60d782c8c519bf664b90429828c9a870f4b8137ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 10508 bytes

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