Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29969e0bea47c62…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 09:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 93889ed2069de799bf2b5a5637334a97 SHA-1: 778fad5f7223d8442b5e7dddfc5f088737e9fcb3 SHA-256: b29969e0bea47c62f87089adc740f7506a0c6b2a190842f2f8df40816117f411
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/award?keyword=2001+silverado+trailer+wiring+diagram PDF link annotation
    • http://tupaxeguna.scienceontheweb.net/what_order_do_you_use_lumin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_601055fb5a677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5fcd5f644ffdf.pdfIn PDF document text
    • http://healthyforczechrepublic.site/jesitoponhk1s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5fcf463973014.pdfIn PDF document text
    • http://idealslim-ordina.site/necronomicon_hp_lovecraft_english0ypqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501046/normal_5fe27f5b322d3.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/bible_atlas_free_download.pdfIn PDF document text
    • http://akb54.ru/97081707781szspm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458840/normal_60271b82b11df.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/behringer_inuke_nu4-6000_amplifier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_5fdb2eeda0cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_6016ab214518a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501962/normal_5fcabab3729ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorazizaxaf.atwebpages.com/rijuzipudejurizimejawu.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_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 5528 bytes
SHA-256: b5d5206902173ab8a3ed6af97250a1fb0db55573ad776ec287009956a9c0178e
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 10208 bytes
SHA-256: 7a4c489f686ecc309ee224f749815f312767797fe11dbb14d8bd1d3b33e805a2

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