Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82e7f9e7b74b94c…

MALICIOUS

PDF

71.2 KB Created: 2020-11-22 00:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a6fd456c0ca166facbd7952821dfd3c0 SHA-1: ebd76075d69a3f55191e90e1ab7ce5097055f3cc SHA-256: d82e7f9e7b74b94cf8133c58eef1b95eb3f76f545c4a5422bf3f3ad700562f6d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the external URIs, 'https://trafffe.ru/123?utm_term=sonic+the+hedgehog+biker', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=sonic+the+hedgehog+biker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fababf8495e9.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/nofimotibu.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/559ed4e6-772d-4789-9620-dd9f378fc03c/words_that_start_with_gle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e5b25f-90a6-4d5c-965c-9519f119e8ac/schaum_series_3000_solved_problems_in_organic_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b55aa5-73b0-48f1-804b-7918164cec71/torrent_game_of_thrones_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45de0043-0c63-4b59-a861-5ef1dd11c342/57440040600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5180b0-6aa2-4767-af81-867e99e6f198/pasedimozumazixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c9d248-c939-4037-8ad7-6cc6575a9e88/toraninasigazajozababeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20da1a2f-8303-455b-a0b6-a68f4c027892/zajajewelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc972d2-9cbe-4982-9b5d-e0eff6442134/parallel_space_64_bit_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e24e09-7d08-43e8-b970-18e39af93db5/gogasefigepak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feab9d04-5634-4f88-a79f-d242ade489d7/3933737944.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5088 bytes
SHA-256: 4fab51b732dc674fbf22fb5893922ecb2a6f042acbebececd8e728f36db5cc84
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 10432 bytes
SHA-256: ec38405a1fae320652c1c07ddd091773181e6a37a4cccb931ed79ae7459a6592

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