Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecb4bcf13a2ce05…

MALICIOUS

PDF

78.2 KB Created: 2020-12-23 08:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 496ae709b7e6139ea25b0f0be8120a52 SHA-1: e5f80d9085f4682ebceff883cd430e577b278cc9 SHA-256: 7ecb4bcf13a2ce0564a4f170890b768d382c9990457d8b68a5081ece3ee58869
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffset.ru/strik?utm_term=my+little+alchemy+cheats+human PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487192/normal_5fce587f1d3dd.pdfIn PDF document text
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/sejesivixiludedukem.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/182954.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/kifegologoteve_tumuzibidobum_wofofe_farijenujole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fe2d283ceffa.pdfIn PDF document text
    • https://lagisarer.weebly.com/uploads/1/3/4/1/134131240/godulowufotimub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_5fb8c3110823e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_5fbce4a3af0e0.pdfIn PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/17bba6e67a.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/vupigeti_limepogimek.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/f88ef7c5-795d-455a-af85-5f535ac76c13/ge_webcam_drivers_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a6a7a6-bf88-4bd9-848a-905bdfafb16f/83389371981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3fc2ea-1270-4171-9f7b-b5f7303d2c65/give_me_liberty_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8282fbb3-7faa-4365-9be0-77af25fbee7b/74241101772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2552e351-a11e-4616-9565-32a5d879bf24/buy_minty_pickaxe_digital_code_fortnite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7dfd3b-208c-478e-b1b3-e51ecdca2579/6629544520.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5048 bytes
SHA-256: e81fb2bdaf792b08ea3d59e28c6028ada60414ff63f57eaeecc7f98a9331223a
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10308 bytes
SHA-256: bd76565130191e707e0d0d16ea9017d64b9d3105a5d5c5981d42ac00539cbb29

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