Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc171b28afca7c0…

MALICIOUS

PDF

77.8 KB Created: 2020-11-19 03:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72d1cb5850e088cfe496c962275f027 SHA-1: 436108d582ff22bdda3721b2feab2188f0cdfd80 SHA-256: 9fc171b28afca7c02752ae479bde481f9636cc49f8ed1c8ebd9533929a0cd68e
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The presence of a 'download button' heuristic and external links, including one to 'traffnew.ru', suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/123?utm_term=mod+menu+gta+4+xbox+360
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/ravib_kejosirepunikeb_gilomutemawaze_foxojorilik.pdf
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/pukapobedin.pdf
    • https://kakezilek.weebly.com/uploads/1/3/4/4/134401463/7be00a495.pdf
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/bozototexedifiti.pdf
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/funubaw.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/3001823.pdf
    • https://vukumurumijolot.weebly.com/uploads/1/3/4/4/134433046/kurotusagipox_wumokamex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8b7559ad-fe32-45bd-bbcc-af58ecd87f16/dajizavenumomivenusoviv.pdf
    • https://s3.amazonaws.com/mexavofezoxi/asl_fingerspelling_practice_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/e2841425-835e-4e70-aaae-d29cbbc05071/pekujojewow.pdf
    • https://uploads.strikinglycdn.com/files/0a638daa-457f-4acd-8783-175c471eed4c/74728127390.pdf
    • https://uploads.strikinglycdn.com/files/cd170711-2e43-4a99-9d91-a661d5a6ff0c/symbol_for_dictatorship.pdf
    • https://uploads.strikinglycdn.com/files/3545e8ed-a649-494f-8f76-d1c1bf74e851/peace_be_still_lyrics_vanessa_bell_armstrong.pdf
    • https://s3.amazonaws.com/gateme/18416821363.pdf
    • https://uploads.strikinglycdn.com/files/505d3d15-6f43-4c54-916f-8c2674a5fda2/17424209732.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce2.bin
523a005fc336404292756f2de7d88d74af35c4e6dfab9059765a79505dc90bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 5436 bytes
font_01_sfnt_off0000df47.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 3720 bytes
font_02_sfnt_off0000eaaa.bin
ecb224abd13faff27450e80371229ed4c5549a5c0174a2f6732b8520be2d8f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 14868 bytes
font_03_sfnt_off00011a16.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 4324 bytes

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