Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde5e24ae1c68440…

MALICIOUS

PDF

67.9 KB Created: 2020-11-21 04:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0918b1bc0e90e84b6ed732646a8ae4e0 SHA-1: 71a849f9b140542cdbcc5b948eee0d4deb7da444 SHA-256: fde5e24ae1c68440e1114a1bcb8a62dd206d8ddb9a65c157be9b764508288ad3
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'traffine.ru'. Another critical heuristic indicates it's part of a PDF link farm, with numerous external PDF links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via the linked PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=sitting+bull+academy+teachers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f9eb4ca92609.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/galoxoruroxodanu.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/ragesosidewitenowup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5fb7e57a9c0ba.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/3f112ea8-724b-4542-a442-b88432964362/94271679831.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/ridgeview_middle_school_tenn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571a5b5a-8480-48d5-a861-f8db7256357c/18423413232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aa20388-6e72-4827-b8af-f6610d32ea60/dragon_ball_z_shin_budokai_2_ppsspp_download_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b566a975-482d-4123-9c48-9e06d2612786/jojowopojajifopazodofa.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/97700654864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4d1619-f76e-4dba-aefc-5b8b839020ef/74214241639.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_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 5696 bytes
SHA-256: 28be2958626cadfe22158397458664b6473f6e6512b1ed56705a266d99cda16c
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10572 bytes
SHA-256: 09dda88b99d6140df5a07efdf2d692d290d9f5e9b0fc8ef1b152aaa1c1bd7997

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