Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8e0ac8cd645b6c…

MALICIOUS

PDF

77.2 KB Created: 2020-12-23 08:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a2ca846db3980f0fc66a8b70f01f93d7 SHA-1: 1db44a3a4f180fb7bfa621827004b554532bbd13 SHA-256: 4a8e0ac8cd645b6c67a25a2df2b3515bce704ef158af59d6973fe9080e356797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'trafffi.ru', suggesting a link farm or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_URI' further supports the attack pattern of luring users to external sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trafffi.ru/123?utm_term=maine+high+school+basketball+tournament+2019+live+stream PDF link annotation
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/105743.pdfIn PDF document text
    • https://pepowogipiwud.weebly.com/uploads/1/3/4/3/134344034/af9bb0190.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/1353553.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/8964926.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/f9696d13-4793-44f3-ba88-e194bcee519b/siworologa.pdfIn PDF document text
    • https://s3.amazonaws.com/lojigevaxive/android_apk_editor_pro_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5c477f-b8f3-41de-82e9-0a81d9858cf4/nudag.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/how_to_answer_amazon_behavioral_interview_questions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce54b0888ad70830bcf59c/t/5fd132eac9c3e442d99bb8f5/1607545580252/bendy_minecraft_mod_apk_god_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/94189432117.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/wekuvowalefen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34100cd1-7f02-487f-a7aa-031ade5f284d/60381446608.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/free_psn_gift_card_generator_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e916d21f-7eca-4cfc-85b2-ca3911a88667/15540808061.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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5964 bytes
SHA-256: 0117b5914c2b46191ec0d385a88d7514b2b14aa67ce4bd3841ebfcb07c53a774
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 11028 bytes
SHA-256: 9b0c3e08da42500bbde6b6be51221fdf1323576d2820644f8568252731de4d1a

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