Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eef40da8824ad68…

MALICIOUS

PDF

76.3 KB Created: 2021-05-30 20:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5a3dcb5d3bfec1fd07fd8cb7c796dc47 SHA-1: 1228aa77cf86b0240d9307956b9d6ad547189195 SHA-256: 3eef40da8824ad6839af94ae56e1fda55ca38ce4afe10a84c77acb6af6a5b7e2
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=pci+simple+communications+controller+driver+windows+7+hp+pavilion+g6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445125/normal_6051e230191ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_604e0749d23dc.pdfIn PDF document text
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/xejewasagitewum-gukawudoje-xaregof-jigesonexiji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5fe39413a7e18.pdfIn PDF document text
    • https://mixutexevegov.weebly.com/uploads/1/3/4/7/134706804/vafawirugup.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/jebimajavodonune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_603401543dbf2.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/turix_ragobovegebotul_paziladajokil_wifawok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405638/normal_601a019ea8eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_602f7d4956fea.pdfIn PDF document text
    • https://zowinalonewexaf.weebly.com/uploads/1/3/4/6/134680062/245577f0a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60205214f0f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_6042d2d51a674.pdfIn PDF document text
    • https://bavimukirisami.weebly.com/uploads/1/3/1/4/131482950/7111986.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/322382fe-2688-49cb-b747-c48751b23f25/dokafefob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db44d09f-7a03-4cff-ad11-9185bc4730ac/koxedowexodedog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9542102a-7a57-4d12-b19d-3106c0c8b2a8/lord_of_the_rings_trilogy_stream_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89cc298f-9616-4f7f-863a-74be2ea45322/94755389140.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_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 5876 bytes
SHA-256: fb15f171141fd6cbebb4f806685cda837e0c806af6f028c2002349c9fa9171e2
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 11136 bytes
SHA-256: 6458a1522898f80604cb3a4a5edb50c80c2b3aab81243732fa2f0c092ceb700a

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