Malicious PDF — malware analysis report

Static analysis result for SHA-256 893410936cdd4800…

MALICIOUS

PDF

61.2 KB Created: 2020-11-10 23:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 124d439ce3e670045e56d468eda2f5c8 SHA-1: d38d711a19e828cd697e523e08f88304bd0fe179 SHA-256: 893410936cdd4800b9365ac55c9aaa392487dc09855df608a4a7df0f0ac4190e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://trafffi.ru/123?keyword=jenn+air+double+convection+oven+manual PDF link annotation
    • https://kazefapakoj.weebly.com/uploads/1/3/4/6/134644741/vawupilo-wurefisewem-gekizalix.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/6443216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5f96ffe3c2050.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/sixasages-kakexotob-dabegowonow.pdfIn PDF document text
    • https://satiwumufov.weebly.com/uploads/1/3/4/7/134724604/timugak.pdfIn PDF document text
    • https://tazomisoz.weebly.com/uploads/1/3/4/3/134344853/mafopamiv.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/wipugikadakube-lotajobikisa-nujip.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/71ba909c-68a7-44d7-bc70-d3589d9b5780/14513959560.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/amplified_hebrew_to_english_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e687280b-f373-4546-a0f1-f2fa850eb67c/93087064761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b334a6e5-5bf3-4b05-acd1-e20e76e3db26/wajonebufarapakizodaxut.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bukekodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0da2c5-5bda-4bbd-8023-1934e69fe4f5/brake_caliper_press_ratchet.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/pieper_ranch_middle_school_logo.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_off0000b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB506 5096 bytes
SHA-256: ed956c45d91841e292adfcef0cef61d55f923988bc71dbc30724550721b8ae0d
font_01_sfnt_off0000c651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC651 9816 bytes
SHA-256: 01fd09185244a5a59527f5e5c6721f953794adf9f9d62da4fcad77990a06ff75

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