Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c77170aa2d23235…

MALICIOUS

PDF

68.4 KB Created: 2020-11-29 02:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6678ee4aeb987315b1b48ed1221fb39 SHA-1: 3d42e083ea31b6f5c0ada73fdc25abbf6d444565 SHA-256: 6c77170aa2d2323561cfa4248e2530e36221669bf8a23134ab5f0b867e9b7997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'traffine.ru', suggesting a potential phishing or spam campaign aimed at driving traffic to a malicious or compromised website. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=lead+acid+battery+charging+circuit+pdf
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5fbb1dbd7ea34.pdf
    • https://peledinupuw.weebly.com/uploads/1/3/4/5/134508745/2101004.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f9530adc2e63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/efcc31de-88c7-452f-bb70-84e536dcd4c7/36156121646.pdf
    • https://uploads.strikinglycdn.com/files/34755247-0d07-4fe6-ba6e-b97fdfd0afcd/belapewuvotavikut.pdf
    • https://uploads.strikinglycdn.com/files/852467e5-a7aa-45dc-8ec1-3baab9771932/classification_of_reactions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ac71a13e-c504-4893-810b-561373ee71e4/5682677374.pdf
    • https://s3.amazonaws.com/tetazino/cara_belajar_bahasa_thailand.pdf
    • https://uploads.strikinglycdn.com/files/2f70c9fe-6781-4f4f-a059-b20e95320ef5/53199458913.pdf
    • https://uploads.strikinglycdn.com/files/0eadd141-a19d-4b8c-872c-62324b713d5c/dawijoba.pdf
    • https://uploads.strikinglycdn.com/files/51108c95-d0c6-49bd-adc1-5c7673e9a436/34091294655.pdf
    • https://uploads.strikinglycdn.com/files/089c9532-a75e-43f4-bb3f-0af54ad11e56/cse_20_ucsc.pdf
    • https://uploads.strikinglycdn.com/files/2e12e8cb-41ec-44d6-9667-6719620cd54f/kesemozoviro.pdf
    • https://uploads.strikinglycdn.com/files/6d85c775-c8d9-4e49-900a-1eadb4a64900/atlas_de_histologia_humana.pdf
    • https://uploads.strikinglycdn.com/files/1e3dfa36-4912-403e-b221-67724b1361da/south_carlsbad_state_beach_campground_map.pdf
    • https://uploads.strikinglycdn.com/files/346d6cd3-e5e5-45f1-952f-ba0f934c9c75/73889001950.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8b.bin
e3a8e5f45bb805784c060506d162e174e99155661efd00f098c98f5c06e47f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 5392 bytes
font_01_sfnt_off0000dee8.bin
0cece681d2bbe8235201e5fd25f2654d6861a76886b21b6340b367455a61fb5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 11120 bytes

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