Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1815f01b084b70…

MALICIOUS

PDF

73.2 KB Created: 2021-03-04 07:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cc9ffd2e7bdb74ca38373dbed970d46c SHA-1: 4fae70be6c29bb68fb63ec8784857e10981276e5 SHA-256: 4f1815f01b084b7071b9a3acb71e98b8d82cba763e304038fb7668c2bd4ddf7b
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a query about 'how much zero in zillion', potentially part of a lure to disguise the malicious intent. The numerous extracted URLs likely serve as download locations for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=how+much+zero+in+zillion PDF link annotation
    • http://hhizmet.com/merunawimucjpuz.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/black_widow_iggyl8frk.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/pinopinoxuju.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/uADjiyX/boston_fruit_slices_candy.pdfIn PDF document text
    • http://ludivabuka.iblogger.org/celeste_review_game_informer.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/how_to_update_di2.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/ShiuCjc/christmas_quest_a_hidden_object_adventure.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/25586895072.pdfIn PDF document text
    • http://kyhni.site/normal_consistency_of_cement_lab_reportcrx3s.pdfIn PDF document text
    • http://menformula.xyz/adecco_vietnam_salary_guide_2020t71ys.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/movie_maker_software_free_download_for_windows_10_filehippo.pdfIn PDF document text
    • http://fruktovik.com/the_haitian_declaration_of_independence_summaryxesh7.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/sarizosadifizek.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/lobizeresobudurebo.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/417234575666qzf3.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/najujetalovurawiru.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/the_rap_game_season_3_cast_instagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 4752 bytes
SHA-256: 4c3d38b0f4dbf700dc645650ead8773d62cd6007d4fc19af362567d2e7fe6d0d
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10660 bytes
SHA-256: 85c4d58a23737f64c88778c2f1e7098982323ab669333215ba0c64fc1c3144d7

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