Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea5f313d91272c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 19:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94f6c3480a52d6e9d26a2c0a29a6aa13 SHA-1: d4bc642b244e39e6e29a3193741637931856e4d0 SHA-256: 99ea5f313d91272cf422b546ae79f547adc16bed3f4bcecc346c9ca6de669a54
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=audi+a6+c6+repair+manual+pdf
    • http://believes.space/78925066513lnc8w.pdf
    • http://reduslim-shopofficial.site/90107203488b732s.pdf
    • http://zoguponuwuxoli.medianewsonline.com/kabewedusevufuxexag.pdf
    • http://evakuator-uga.ru/ruwifomanenise8k4wn.pdf
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/26e7331667ebd.pdf
    • http://crawlmqyu.space/40112703656qyjch.pdf
    • http://cmb-eco.com/laxop94gyw.pdf
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/1a3fdd385.pdf
    • https://bezubimuxidisa.weebly.com/uploads/1/3/1/4/131453869/dd98421f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4dad7bc8-e348-4b1f-8385-5dddd5966793/modadexususajobuluxalof.pdf
    • http://mifofoxidil.onlinewebshop.net/vaganexewuwimix.pdf
    • https://uploads.strikinglycdn.com/files/4aeb876b-3c01-4d9c-bb1b-4d4165f3e0a3/bibutugoravapis.pdf
    • https://uploads.strikinglycdn.com/files/109d9525-13db-45a1-8498-471de49c5d75/casio_ctk_2400_price_philippines.pdf
    • https://uploads.strikinglycdn.com/files/4e43ad00-8fde-4032-beef-eb60394919ab/54381245260.pdf
    • https://uploads.strikinglycdn.com/files/78302fbb-1835-4f1c-9d76-576b5ece4ceb/78292303729.pdf
    • https://uploads.strikinglycdn.com/files/0686d807-4755-4740-858a-2b629e79723f/wojeguliwuwufakodur.pdf
    • https://uploads.strikinglycdn.com/files/77e18dbf-1144-4c99-ae62-a70b4be78e5f/boxupigupod.pdf
    • http://tajiroxajesolut.atwebpages.com/bel_ami_guy_de_maupassant.pdf
    • https://uploads.strikinglycdn.com/files/4b958072-1b10-41d0-bfca-56d68a4ceb3c/89569020519.pdf
    • https://uploads.strikinglycdn.com/files/a824e361-8c0a-4201-8222-dce5b8d8287f/99397668501.pdf
    • https://uploads.strikinglycdn.com/files/e70883b7-2075-4e04-a67d-9011133bc294/8849615109.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_off0000effb.bin
2f153364202edd192f67b68f6c0ab5c1567746efc4bb05aba08d029254a32ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 5264 bytes
font_01_sfnt_off000101cf.bin
7bb81eb1064fc6aba7a0531463553b5c1a5513c5978acb62f0740b853c4e5251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 10976 bytes

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