Malicious PDF — malware analysis report

Static analysis result for SHA-256 33182d51ab4cf957…

MALICIOUS

PDF

62.9 KB Created: 2021-03-27 19:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e459afc11a43401bd8f2762bbf9adb SHA-1: 8503345c380c1e1a0379231976b9b4a9f2bc869c SHA-256: 33182d51ab4cf957af3b622a6c253489175b649d4e632bda63a740583ae3dfc2
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services or domains with unknown reputations, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/123?utm_term=cherrypickers+guide+2017
    • https://tawozajoruje.weebly.com/uploads/1/3/4/3/134314125/xubotafijawegud.pdf
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/rereweturojun.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/fegizibapeju_wanajuro_ketenijekituva_wenoxopuwa.pdf
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/dugilujij.pdf
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/fuwow_dimimowotiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_2674ed8174b64d689103175d037e7353.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8bffb77f-054d-4d5a-a1bf-fb5b099fd79c/cask_of_amontillado_analysis.pdf
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_c3f19308b62648c98518742fdf13b98e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/006f616b-9018-467b-8353-7f171be336e5/xakipekopevisejapomu.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_9f0ca973cd5c48fe9612f43f1377ecc8.pdf?index=true
    • https://s3.amazonaws.com/wefadep/transcription_and_translation_worksheet_biology.pdf
    • https://s3.amazonaws.com/mipizaju/reading_comprehension_strategies_skimming_and_scanning.pdf
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_3147d93cd8014d91aff627bc019d62a1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ffe3dc56-9616-47d1-bc64-632def65fd01/how_long_to_cook_steak_on_george_foreman_grill_well_done.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_bc35aea66eaf49138a70fe4ade7feb01.pdf?index=true
    • https://s3.amazonaws.com/zolerazowubow/natotifago.pdf
    • https://s3.amazonaws.com/towutoginadivu/25492414472.pdf
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_556b9d62e67b4bec820cb8d991b1babc.pdf?index=true
    • https://s3.amazonaws.com/baritexovopa/79864280565.pdf
    • https://uploads.strikinglycdn.com/files/0887c717-10fe-42bb-8121-83d643167e87/gapuliwolemumibaxededurij.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d407.bin
bf37167d5e8648ab868d8b54b7c8f6efcb3d829be3f11672f4a8d7771b116441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 5572 bytes

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