Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5630fc503a6d661…

MALICIOUS

PDF

93.9 KB Created: 2021-05-27 22:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6c768e3e6bf5157e15d79635a47bb73e SHA-1: 9f5c03fc2446e1e0eb5c22066a2fa80eb2d3514f SHA-256: c5630fc503a6d6615cf95e01379549535d0734ae4090b5268c011349651fae99
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of many external links indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=beirut+movie+imdb+parents+guide PDF link annotation
    • https://nikokitigo.weebly.com/uploads/1/3/4/5/134500207/lugomudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_600530162e3ec.pdfIn PDF document text
    • https://jabekidedur.weebly.com/uploads/1/3/1/6/131636775/52efa05e2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369923/normal_5ff06f8ee690d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410000/normal_605354bc08eb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fe8a2251591b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_604509008b304.pdfIn PDF document text
    • https://ragenakesigufu.weebly.com/uploads/1/3/2/7/132740294/5123243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/accae538-4899-47d6-bdac-cf11af536c63/55194584926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b22ffa4-7256-4587-aebb-f47a90027f67/deburalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5a296a-16a2-44a1-8ce6-62634ea17d2d/dd_beyond_subscription_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31dcb60d-8fc2-4120-9056-971e79f8562d/where_is_alexander_the_great_grave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44f63a3-9418-42a2-8a60-af17fbe78000/leave_letter_format_for_college_hod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eaf4e1e-5417-4aad-ab61-c85f5e6a03c4/vizio_e601i-a3_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976dd83b-3df6-4f8a-b15b-5650af1115dc/17104095863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cffff05-e451-481a-96c8-04e64f491321/26157486506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea50f5f-eff0-447c-b011-5d90897a5206/wetufawedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9c9429-5c5d-42a9-9a37-b96333c6714e/79542429640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde8675d-afba-4c53-a5e1-ac06c434469c/how_to_set_a_ridgeway_grandfather_clock.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 5496 bytes
SHA-256: 93ad0b952562f7ddf4cb53a693260fb248e2a50b408e320721fa9102103fd4a9
font_01_sfnt_off00013ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF0 13264 bytes
SHA-256: 1cbba371094a5d945355bc960aa3ffe525d524ce4bc51568217335b0b51163b9

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