Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f9c31b678b20c1…

MALICIOUS

PDF

83.4 KB Created: 2020-11-26 23:17:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9197d81170e625c6ff44131f1ded4aaa SHA-1: 7b7bd2cf5f2f2e1876652d63e745f36321827a89 SHA-256: f6f9c31b678b20c14ed38b12acbfc5ca5e8036a9412030f3c56769495225873e
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or link-farming scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to exploit kits or phishing pages. No scripts were extracted from this sample, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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.
  • 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://traffmen.ru/123?utm_term=shore+protection+manual+appendix+c
    • https://xazopitanajemav.weebly.com/uploads/1/3/4/7/134714933/6895155.pdf
    • https://rufewukel.weebly.com/uploads/1/3/4/5/134599372/ribediveworufuworo.pdf
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/e55d695c4605e20.pdf
    • https://waratuzinasu.weebly.com/uploads/1/3/4/7/134719343/7654916.pdf
    • https://cdn-cms.f-static.net/uploads/4474999/normal_5fb004d047dc0.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_5fba24e10033e.pdf
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/rumowesamimugep.pdf
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5f9052f465d28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotizifime/bangladesh_bank_exam_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/e354be82-d074-4849-b661-7fb9947a1f05/monocle_guide_to_good_business_download.pdf
    • https://uploads.strikinglycdn.com/files/13096814-a20e-4c75-9ac4-285328bcb33b/35525099376.pdf
    • https://s3.amazonaws.com/zinudipir/coaching_agile_teams_by_lyssa_adkins.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099e.bin
7485bd0816688a0bb31ff7ab16f4cfc4a06734a30f306c230822620dd8203070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 5304 bytes
font_01_sfnt_off00011b85.bin
e1e319a5c9988d9e9dd334efb14ad22a0a36afdc7650bc0056b3cc1296c703c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 11076 bytes

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