Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1301fcdc4466d20…

MALICIOUS

PDF

67.9 KB Created: 2021-03-25 14:58:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 177568f8bd9ecda86a0b4bdc59a75a8c SHA-1: 9df03c8ba897b31d23dc5989967fdc5760db5137 SHA-256: c1301fcdc4466d20335d64e605c646426ad76eff5ecd549b162894689b59fb79
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/award?keyword=adjectives+exercises+pdf PDF link annotation
    • http://pupigojoniru.mypressonline.com/acet_entrance_exam_reviewer.pdfIn PDF document text
    • http://resipowepo.getenjoyment.net/ccna_routing_protocols.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/32139340034.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/lilerula-likeletiwaregi.pdfIn PDF document text
    • http://javosewo.sportsontheweb.net/standard_normal_probability_distribution.pdfIn PDF document text
    • http://roselosudeve.sportsontheweb.net/what_did_the_inventor_of_the_10-ton_truck_so_often_say_worksheet.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/43594212084.pdfIn PDF document text
    • https://leludexubivavij.weebly.com/uploads/1/3/1/8/131860378/poluderasij.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/gotonara.pdfIn PDF document text
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/4614591.pdfIn PDF document text
    • https://pudevezogezuk.weebly.com/uploads/1/3/4/5/134528534/9d10d8abb1cc34c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_86cad34ad2e74498a010610214e078c8.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_fa4b50c8a64746fcb024129d8724aa8b.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_2d871ef38ef440dead90a4282ee9f9eb.pdf?index=trueIn PDF document text
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_56f2c6d5ed9a433392c437f234073c77.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_b89491745d0a4e62971de5a013a48246.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ac560530b43e4446bacc42663e71707a.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_58322fe51942457e96c78ff6baa09202.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_3d8ac9f3f9bf471799429fde53c5e6ae.pdf?index=trueIn PDF document text
    • https://7043ee2c-bc2d-4d46-b82c-b0075177c1aa.filesusr.com/ugd/f862b5_5aafcf7989674f87b3af778103710140.pdf?index=trueIn PDF document text
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_fd6bac303f3e482080d1a6022237e047.pdf?index=trueIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_98db23765e3348a396905d436b364258.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_ff389c8e4db54a34bcd460696f19dee3.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_53977f2ae5fc47948d419a5893932fa6.pdf?index=trueIn PDF document text
    • http://jopubijako.atwebpages.com/64667669160.pdfIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_0de85950798647379b9d9606fda14c43.pdf?index=trueIn 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_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 5100 bytes
SHA-256: ef72f03e85aff312ea04087314058a60b690fa017e71ce32043bfcab06bac82f
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10016 bytes
SHA-256: b0cb37618c46140ac112e074781122003972bbc3aeeebc9054d484e44f9ca8cf

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