Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72f941a3a13827c…

MALICIOUS

PDF

64.2 KB Created: 2020-12-30 07:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c09b56d80fbeec4716fddbb89cccc777 SHA-1: 7494818d851dc2219f78ad07896b9934e513ccd8 SHA-256: a72f941a3a13827c2ccdec4bf752edea3fb79fd82c460e8e661ffa4d63e5cbef
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=bench+seat+cargo+net In PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/kezonezabam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5fa4456378890.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fdd401155b7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fb0181daf8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f977916a6056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_5fe80b2cabd19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_5fb28d63c0d5c.pdfIn PDF document text
    • https://gekeforoka.weebly.com/uploads/1/3/1/4/131438206/jikixun_manunun_vixajuxonezu_riwuloxok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368226/normal_5fe313a638284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5f947a4125cfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5faeac2b55c6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f941411c2352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5fd7ae0c81f6c.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/S5taRBB/chess_checkers_backgammon_board.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_off0000c1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AD 5080 bytes
SHA-256: 9e018e9d0af57ba9226f236b24a3009e044331b69a0588043a1f251644bad347
font_01_sfnt_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 9724 bytes
SHA-256: 98c4ab5762fbc8a345d0308bedef3d3d1e200e9278e7dc67b4e684b6c9ff74a9

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