Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22251889b923cb3…

MALICIOUS

PDF

85.9 KB Created: 2021-03-15 14:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8e76feeb560ebbb4c698f624c5751e4e SHA-1: a6b2ca78ddec285b518e057ab0c08c408314ab53 SHA-256: c22251889b923cb346589807e70f99755e23f16fe46e079d5cb579cf3f1606d3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or link farms, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation scheme, likely involving JavaScript execution to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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.
  • 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=how+to+use+texturizing+spray+for+beachy+waves PDF link annotation
    • https://cdn.sqhk.co/tinukomafiro/bDjaIja/fosipubolulin.pdfIn PDF document text
    • http://qrettalq.online/computer_organization_and_design_online_content4uqc2.pdfIn PDF document text
    • http://medway24.com/65975808031ox6iz.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/ashfgif/play_and_learn_checkers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/ginijetemepa/gitihhf/dulan.pdfIn PDF document text
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/60ca236.pdfIn PDF document text
    • http://eslife.pro/what_do_vegetarians_eat_for_christmas_dinner0g94n.pdfIn PDF document text
    • http://fruit-ital.space/35599267300dh2z3.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/06d79e7ac3.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/7905671.pdfIn PDF document text
    • https://vuwadano.weebly.com/uploads/1/3/4/3/134350870/9ba3bcff7a.pdfIn PDF document text
    • https://kodepifaz.weebly.com/uploads/1/3/4/7/134705681/dec59076b5b938.pdfIn PDF document text
    • https://zukolipiniroti.weebly.com/uploads/1/3/4/4/134494738/5423021.pdfIn PDF document text
    • http://jobware.pro/what_are_the_tags_attributes_and_elements_of_html9mru2.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/early_civilizations_ancient_egypt_in_context.pdfIn PDF document text
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/4036711.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/duleniv.pdfIn PDF document text
    • https://vexokefiveve.weebly.com/uploads/1/3/4/4/134494279/mimanuf_wiwudanure_bizutewo.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/how_much_developer_to_mix_with_igora_hair_color_10.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/maxiz-pedakisela-pozafuv-gikatiwo.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/4923523.pdfIn PDF document text
    • https://webesamogamafi.weebly.com/uploads/1/3/4/0/134012635/romib-zevaloxowota-wodalilexi.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_see_cracked_passwords_john_the_ripper.pdfIn PDF document text
    • http://talemine.getenjoyment.net/12219193878.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 5720 bytes
SHA-256: 5a0eb667ffbb27155b3d437a1d0f29a68989706b271aaa39ccb3a0e79da49540
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10760 bytes
SHA-256: fa9856adcd1bbe83ee7f1d49c49aa4124a75836b829a98c811efe83dbd44d456
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727