Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1fb6d4c07dcea1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-13 10:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c10414b85ffc4881a39dedf6a32a9ba5 SHA-1: 912f6c2913a5087f19ce75ed0f59bbde0561a7df SHA-256: 6d1fb6d4c07dcea1d4076ed0bc08c7b12020658977330a7377c461edf182e3cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The presence of a large number of external links, including a link farm, suggests an attempt to redirect users to malicious sites for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=the+power+broker+audiobook
    • https://cdn.sqhk.co/bepifopid/jNgc5ig/forbes_magazine_cover_template_png.pdf
    • https://jokiputukalak.weebly.com/uploads/1/3/1/1/131164130/komiziguwiz.pdf
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/wenivunetow.pdf
    • http://tarigutese.mygamesonline.org/alpha_amylase_inhibition_assay.pdf
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/folodo.pdf
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/jazezikisasonine.pdf
    • https://rodofuzox.weebly.com/uploads/1/3/4/5/134599037/3662340.pdf
    • https://tefuxaforubexo.weebly.com/uploads/1/3/4/4/134446539/xuvagorepe-kedesumisu.pdf
    • https://cdn.sqhk.co/konajera/LthfsUO/slots_deluxe_free_slots_casino_slot_machines_freebies.pdf
    • https://luwosixikitap.weebly.com/uploads/1/3/4/6/134628352/1936189.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/padawupelobu_bozunuwogiraw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_9abc2c1ced1c4a24b968770eb174a47a.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_f7af53ce86ad4228828c884114f57383.pdf?index=true
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_39cdcc37bcce4d5c8427894f6790c441.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e6f25b78-87a0-46f9-83bc-62f8e1193c2f/how_many_years_to_study_electrical_engineering_in_south_africa.pdf
    • http://vekejuf.atwebpages.com/how_do_i_turn_on_telstra_call_forwarding.pdf
    • https://uploads.strikinglycdn.com/files/3e581c0e-f7bd-413a-95bd-59452b3fd1e6/what_bike_lock_does_the_lockpickinglawyer_recommend.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_off0000ec22.bin
bd3c8a3573b4256209c34ed54e572b3b2d6e3c37cd24e8d4cc5c02827194be63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 5084 bytes
font_01_sfnt_off0000fd71.bin
7321c219082dccaf264649c6644f6883788961536a391f0745b634dd5bca11ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 11196 bytes

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