Malicious PDF — malware analysis report

Static analysis result for SHA-256 78beae877a2d7f5a…

MALICIOUS

PDF

81.5 KB Created: 2021-04-22 13:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91cdb359e17a9cf7481c9e4bf997fcd SHA-1: ea4bc645a609debb991b2308236d48f82541eeae SHA-256: 78beae877a2d7f5a68128d65cafdbb0e6b0b11a2a19f1818896e68e2f2b97278
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI, 'https://xezojetit.ru/strik?utm_term=xr2+remote+volume+not+working', is directly associated with the document's apparent technical pretext. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive linking suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=xr2+remote+volume+not+working
    • https://cdn-cms.f-static.net/uploads/4387701/normal_604b578486af6.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_6058ed16430d5.pdf
    • https://cdn.sqhk.co/nebafori/Pk9jgZG/skin_editor_for_minecraft_3d.pdf
    • https://static.s123-cdn-static.com/uploads/4446772/normal_6009542ede60c.pdf
    • https://cdn.sqhk.co/kimorotadopo/6Vgghew/8718945007.pdf
    • https://cdn-cms.f-static.net/uploads/4450045/normal_60325b1372a10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_4e12960e32f94834a782e55e523e11b4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2e26de66-90d9-4c9c-9d80-f3260a323493/hp_5610_all_in_one_printer_ink.pdf
    • http://mugomodag.atwebpages.com/understanding_symbolic_logic_5e.pdf
    • https://uploads.strikinglycdn.com/files/ae1529c3-cb82-4c01-8f5d-045d0c9acca2/what_is_under_daisys_bed_in_girl_interrupted.pdf
    • https://uploads.strikinglycdn.com/files/8efd950d-c79b-4cf4-84f7-031288500acc/basic_english_worksheets_ks3_for_free.pdf
    • http://dawejur.atwebpages.com/69793735185.pdf
    • https://uploads.strikinglycdn.com/files/2ee58da5-3e14-4598-9770-8344cf4158c3/66259859407.pdf
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_daf7860077d644b3becf079907597748.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c37f10f-c137-4144-bca3-e204ed0769be/chinese_moped_repair_near_me.pdf
    • http://zozupajekuledus.myartsonline.com/87610323204.pdf
    • http://wegamaluperetuj.atwebpages.com/55575153921.pdf
    • https://uploads.strikinglycdn.com/files/09916d42-ccfb-42d9-96fd-1d1e05f5d6ca/vicks_sweet_dreams_cool_mist_ultrasonic_humidifier_manual.pdf
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_eb8e273c87ba42fc92f03ef6afb4bb8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5bf8467-6b2f-4100-a1c6-81976e5d34e8/44760438062.pdf
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_d411c669929d40d5a52687d2c3854c86.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72e.bin
ec0617e7d4b767a4f38c4993bdaaecdad4a8b4ca688b321d2bd370a6bc92076d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 2828 bytes
font_01_sfnt_off00010137.bin
b76d06f143a361b613a36d9463263e59b1e5fee2b0f8c79b3b0cd7d84db4c4e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 4944 bytes
font_02_sfnt_off00011209.bin
e9793f210eb9b06fed04e44e206dacef8c317b5e617f1c40270830ee7e7c976f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 10980 bytes

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