Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c91b0f4763ab0e6…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 10:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ed5daaea29a69e912345840000c27a6 SHA-1: 872b5ded370889c388f20987a3a9b525cf375a27 SHA-256: 3c91b0f4763ab0e62ce72a0bee245671edd4c66b088167f2348be7df928b6e73
156 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 0.9995

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://mezovuduw.ru/123?utm_term=directv+nfl+network+channel+guide PDF link annotation
    • https://zexaloguf.weebly.com/uploads/1/3/4/5/134576330/refezedebozo_zaveropi.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/igi4ifv/the_communist_manifesto_book_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/ifOjfoV/lazomigojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5fcf877ee9e8b.pdfIn PDF document text
    • https://sinekaku.weebly.com/uploads/1/3/5/9/135964305/kirupulov.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/hbjfnih/vadimenijugivifanonaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_600f921feeb62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366043/normal_5fd05113d434c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5fdc29d2d17fe.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxogubajo/dMgchex/difomotogudizatalex.pdfIn PDF document text
    • https://cdn.sqhk.co/zurajekiviw/jghiEqU/dark_background_images_hd_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/3260451760.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/sabavalekupekigaluge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b5929a-478a-4b84-bcc9-acea7590d540/71348322750.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/terobozelokomade.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/17733398751.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/refidemafi.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/45401537601.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/97345379906.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/46520147605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b91b843-99d0-4a7e-93cb-353583d29dd0/mivazigubidiridezed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb9f1b2-680f-49be-a35f-654bebd6f31c/leccion_159_aprendiendo_un_curso_de_milagros.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 5320 bytes
SHA-256: ce9264c73a4bd7879c297b53389d4993d00c64335922de4b93815959cc8e866d
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 10728 bytes
SHA-256: 6e926f83f992dca32162781c5199cd7d7fbca629575d2b0768b2b091cb9a179b

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