Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cea0a594e0eb4b3…

MALICIOUS

PDF

78.1 KB Created: 2020-11-26 09:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6928caf174cbb2af2059586eb3ee82a4 SHA-1: b07c0e919a982c9d416f83a0523874042a4ccca1 SHA-256: 7cea0a594e0eb4b3288c45c13d3dc342f8ad26f2b4de0b4f5eba47990085e66d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://traffine.ru/123?utm_term=zener+diode+voltage+limiter, is embedded directly in the document. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through the link farm.

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://traffine.ru/123?utm_term=zener+diode+voltage+limiter PDF link annotation
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/2880783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fa147d900568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5f9978b208a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fa4c3f7de3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_5fbbc210bd223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376371/normal_5f8c3e5837e87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/798f2ce9-6ee8-4f41-891a-2e175813eb98/paxudizawisese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb21d8f-c0be-4a37-9ae4-7cd9338fb0c5/litton_s_weekend_adventure_instagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc500750-c688-42ef-9fd4-2c3a0c95355b/tovulizesogoputolexezeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fbb2b8-92e1-4382-9a5d-d7be2423e8db/35572745343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e8a20c-b568-4663-b93a-cc5fa72380f3/cook_up_a_storm_full_movie_in_english_dubbed_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3707fc6-c382-49dc-aa60-0b73865b4412/90614860191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e25b12e8-ffee-45e8-8c1e-5029b92729bf/waking_vigil_god_roll_menagerie_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e37579-90b6-4037-9a10-60873c189108/brainpop_great_wall_of_china_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26dcc7ef-6d0f-4782-8969-3e4b2bff6dd3/18065610810.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 4772 bytes
SHA-256: fc0492d93b557eeebaf328df91cdc2fa1d63b925c8b7f193a6029238b0225efe
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 11824 bytes
SHA-256: 9b69b73a66aee76b409bb86e2799df2e03cb81ed7d30daa1a161059fb2d17209
font_02_sfnt_off00011d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D80 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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