Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8b058f36b75fdf…

MALICIOUS

PDF

171.2 KB Created: 2021-06-07 09:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 42bd9eb19538df33def983dcf7d62346 SHA-1: ae485ef5a7aabc82ba2411586b9c25aed3245008 SHA-256: 8c8b058f36b75fdf43b5b33efd49c36ade4b1c702412f6cfd9857e473a342d2e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous embedded URLs, many pointing to disposable hosting and acting as a link farm, a common tactic for phishing or malware distribution. The presence of embedded JavaScript, although obfuscated, suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://smidgel.ru/pbw?utm_term=critical+theory+contends+that+schools+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381536/normal_6050f22ccbb9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454684/normal_6004d9536b4c1.pdfIn PDF document text
    • https://bewulikafujisew.weebly.com/uploads/1/3/5/3/135326730/4d0239dc65ff6.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/4aeff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fde5bfd50f1f.pdfIn PDF document text
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/b5337.pdfIn PDF document text
    • https://jawifimubagibe.weebly.com/uploads/1/3/4/3/134310986/delufufab.pdfIn PDF document text
    • https://jopojikifereter.weebly.com/uploads/1/3/4/5/134519769/7602146.pdfIn PDF document text
    • https://lojawosexofiv.weebly.com/uploads/1/3/4/6/134636472/5390621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://safopiluzaw.pbworks.com/f/javumi.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/w/file/fetch/144700227/63634834941.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144500361/93966167774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bab5ff-72ae-4360-b47a-c18e4f0d7165/panasonic_viera_plasma_42_inch_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7fe500-8484-46d9-871f-a4c7df5df872/77235525132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf70f41-3d78-44f3-80f8-86e02b1d31bb/dukuvizimuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f1ce08-1d43-49d3-a32b-bf62a1116b67/the_critical_path_of_a_network_is_the_path_with_the_most_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7339f4a-ed52-47ad-882f-61654048dda7/sanolanozemixogoxilakogam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48248adc-ec29-4be4-bc42-97aef0992661/samsung_t24c550nd_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c2ff4a-53e6-4e67-a19c-d510bf2d4630/29812769017.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F4D 5208 bytes
SHA-256: bbdb5050e27bcaa4fef400406ae05349f4c343666b5aa3fb58f4c4572236777b
font_01_sfnt_off00026101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26101 11936 bytes
SHA-256: 7c5ee85a51ee2b0c14ae711a86d57c508e5c25c1322f6ccd84a2d20407152c81
font_02_sfnt_off00028900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28900 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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