Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4cd0662b0d24a2…

MALICIOUS

PDF

76.1 KB Created: 2021-04-05 13:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20189da8d6840161d26a1a50f856f197 SHA-1: d030ac049dfac39b63e66553d2b48ee78b58920b SHA-256: dc4cd0662b0d24a2c3240e72636979e45a8088428d847fccafd6077ba66ffcc0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=kenmore+appliance+repairman
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/d3e0766d43.pdf
    • http://mobile-media.moscow/how_to_clear_bluetooth_pioneer_mixtraxmrhd7.pdf
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/1ac9f5d3f07.pdf
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/d767f7.pdf
    • http://ewop.space/how_to_use_the_light_meter41nfx.pdf
    • http://krokoboko3.xyz/escape_the_labyrinth_bookz1e6d.pdf
    • https://cdn-cms.f-static.net/uploads/4422367/normal_604b03263dedb.pdf
    • http://robolab.one/connectify_hotspot_pro_2016_full_crack0q0kj.pdf
    • https://cdn-cms.f-static.net/uploads/4491445/normal_6023c14fde920.pdf
    • https://pomadiwu.weebly.com/uploads/1/3/5/3/135313662/foneze.pdf
    • http://mifvideo.space/vudebalupotimadavepebf8j6a.pdf
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/2864331.pdf
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5fd84e8841f41.pdf
    • https://cdn-cms.f-static.net/uploads/4481847/normal_602aff395d978.pdf
    • http://detonicufficiale.website/essentials_of_understanding_psychology_11th_editionymtc6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_1c59cc017382448ba5097d601a0b2369.pdf?index=true
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_180367e4a76b4c7b8f349ea12458a857.pdf?index=true
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_9c39688972a84fab96cc7064ec4be450.pdf?index=true
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_7794b50139814ffaba16a5468836184d.pdf?index=true
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_6fa62bd449984f28ae237b251e7fcda6.pdf?index=true
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_ee88435e0c5e40cc92317c1f80e10f4b.pdf?index=true
    • 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_off0000ecde.bin
de8dba2a6527f0d787e1d4f69399f12704ff295507e1febe466e6de94a3205c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 4872 bytes
font_01_sfnt_off0000fd5b.bin
50608630a1f31832d704b55080eb7f925583ce196ddd681ae35be86795b30cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 11152 bytes

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