Malicious PDF — malware analysis report

Static analysis result for SHA-256 d035a2270e9d6efd…

MALICIOUS

PDF

69.1 KB Created: 2021-02-18 05:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7164abe19dbca91fffd1347bbb1cdc3 SHA-1: 5654db0248c6630d28405c29f2418523a6f37f66 SHA-256: d035a2270e9d6efd5c972dc019d800b4fa864d944d5c4e0a88f40bb5ffca04e4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=resucito+cantos+del+camino+neocatecumenal+pdf+2016 PDF link annotation
    • https://nikubasixuza.weebly.com/uploads/1/3/0/7/130738960/minin.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/gamuxukufixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475580/normal_5ff7937c4f181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_600156dbdc2d0.pdfIn PDF document text
    • http://xivisugewikoju.iblogger.org/viwematovo.pdfIn PDF document text
    • https://cdn.sqhk.co/mozigizax/PLgdtgi/razuguge.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/kgin2gd/chili_s_delivery_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/tVhhXFV/werukowuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/aC5ghie/xofukesolejikedifumepiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/egjgdjc/8907362874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_600d94cb5f36a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_5fd0fdd70edd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374976/normal_5fc90dbb1bc9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lotawegikuk.rf.gd/hayward_pool_chlorinator_cl220_parts.pdfIn PDF document text
    • http://tuwetixa.epizy.com/encroach_on_crossword_answer.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_off0000ccc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC1 5692 bytes
SHA-256: a6c6eb4e319abdc0e811c5bb06e9f4bec12a8d178a800bef259a84b7a18cf2b0
font_01_sfnt_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 11460 bytes
SHA-256: 08f054857775fa8b48e1c362ea22546e31bc819b90d2b0fbd342c817a25b9237

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