Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca3c8010ec107d6…

MALICIOUS

PDF

67.4 KB Created: 2020-11-20 09:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f0e8121a1c17d0cd73931f854f51f85e SHA-1: d7f5eeb71824a538da0a627a0851a033144b2bf1 SHA-256: 5ca3c8010ec107d65c7fd25e374ca88db48dcfb108e2bf8f72fbafe79b055a89
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a large number of external links, many pointing to benign-looking PDFs, but one primary URL, 'https://trafftec.ru/123?utm_term=arkansas+traffic+crash+reports', is associated with the lure. The document's structure and the presence of numerous external links suggest it's part of a link farm or phishing campaign designed to redirect users to malicious content.

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://trafftec.ru/123?utm_term=arkansas+traffic+crash+reports PDF link annotation
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/wifigugitipewekan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fb70933c96f1.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/876752f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5f99be724d989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/brick_n_ball_game.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/the_law_of_sines_and_cosines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0296c4-382d-4c88-afe8-cc9d5007af86/74149529372.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/abas_3_scoring_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7772c024-09b9-49f9-a959-1a160cac136f/99857171380.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/bobo_tv_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b3209d-431b-43e1-88a3-67d9a59bb611/95723351126.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/57057718293.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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 5124 bytes
SHA-256: f895c102b9fad452fb6e389a4e2acf5e53336c3a9dede961ad81307cc0291302
font_01_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10792 bytes
SHA-256: d504b45cce1663e89489765cf0f37813de344076d6b1bd7baf9e09a103bbb4f9

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