Malicious PDF — malware analysis report

Static analysis result for SHA-256 f341ec811823c778…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 11:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b020731ba72ce6040bf6cfc2a6d6174f SHA-1: 82d0a7f316a42249c06761d3c214fdd55b5bd532 SHA-256: f341ec811823c7789661153a4713b772c8d33a6b349da29b079094650a7158d0
246 Risk Score

Malware Insights

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

This PDF document is identified as a credential phishing lure impersonating Apple, directing users to click on a link hosted on a Weebly subdomain. The PDF contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/zabijaruvu_rivusapikibizo_kirono.pdf.
  • 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://bologen.ru/123?utm_term=how+can+i+change+my+voicemail+password+at%2526t PDF link annotation
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/zabijaruvu_rivusapikibizo_kirono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_60292dcb46fc5.pdfIn PDF document text
    • https://fadesirowawilej.weebly.com/uploads/1/3/1/6/131606674/digibivupijigax-gusitojazepa-vijafita-zegemakilufas.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/hSjfFnr/blacksmith_stoves_instructions.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/3717340.pdfIn PDF document text
    • https://rarejitidod.weebly.com/uploads/1/3/5/9/135993923/xumika.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/8020170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_5fcff1d5193f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5fe335387ce3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_60137ee2b9cb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fefa1f596b33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wofaketizezoja.epizy.com/53961052356.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/certyfikaty_depozytowe_s_form.pdfIn PDF document text
    • http://rulenanevatetid.epizy.com/86868066611.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/giratina_altered_form_counters_pokebattler.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/16734563602.pdfIn 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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 5700 bytes
SHA-256: e51d525941ac39fe58f6517405e0d0877572244c9bcba22a4eb7d5edd4ae32cf
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 10500 bytes
SHA-256: 52c353299b5d2c21e17ab3d9dca27a4c9156c2b37a1f387398f3a1ed5c03f730