Malicious PDF — malware analysis report

Static analysis result for SHA-256 535996341bd4076a…

MALICIOUS

PDF

66.0 KB Created: 2020-11-20 04:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2996248146789b5f59dcf1393630e78 SHA-1: dcc7bc73faf6996b2b8f8bcb00e07b837daf6639 SHA-256: 535996341bd4076aa81f3c8b468a64985edf020786ddf0182d70cb73d5903734
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm containing numerous external URLs. The ML classifier also assigned a high probability of maliciousness. The presence of external links suggests an attempt to redirect the user to malicious content or further download stages, aligning with a phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=judith+mcnaught+kusursuz+pdf+indir
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/vufigizata_vefowexeg_towutezizevifot_dizajikosixi.pdf
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fae72bf31c0c.pdf
    • https://cdn-cms.f-static.net/uploads/4393018/normal_5f9508e469e1e.pdf
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/gixurejenawib.pdf
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/wibogefezit.pdf
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f91f0d33b8a2.pdf
    • https://cdn-cms.f-static.net/uploads/4427295/normal_5fb3336a85d7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/194c7bf3-2b05-461d-8de9-8a8a8f23ec5e/igloo_cooler_with_wheels_walmart.pdf
    • https://uploads.strikinglycdn.com/files/7e8a0d35-0466-406f-8ed2-6df0155d59f0/roundup_realty_property_management_sacramento.pdf
    • https://s3.amazonaws.com/pukasojalu/the_ramayana_r_k_narayan_summary.pdf
    • https://s3.amazonaws.com/divelatoxa/farberware_wm_cs6004w_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/6d330e22-23d7-4dd4-a80b-63c8f023895d/busowewara.pdf
    • https://uploads.strikinglycdn.com/files/d442afff-3046-4f3e-a64f-bb791fca80df/51815131274.pdf
    • https://uploads.strikinglycdn.com/files/e1dc9187-a5c3-4c2e-a36c-64023c8e9c47/84451408349.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_off0000c538.bin
55e70abbe6d6e71602223a1407577f3a8d570362f0e861bafd6a19bdbaa6e971		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 5640 bytes
font_01_sfnt_off0000d840.bin
b99bb5b97ff795851b70592975d8ec050e06a8c5400c39fbd9a4af94d489d7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 10192 bytes

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