Malicious PDF — malware analysis report

Static analysis result for SHA-256 f414edd4a91fa9a1…

MALICIOUS

PDF

68.2 KB Created: 2020-12-22 03:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c7932acea6270eef9d68496f1d9f6cd SHA-1: 2775e9148fb63dfb83be34561194caeafa5260ad SHA-256: f414edd4a91fa9a18463e975a22c0e31261ebabdc52ccf9b65d52966afeceafc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and external link farm heuristics point towards a malicious document designed to drive traffic to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=battle+for+wesnoth+ios+review PDF link annotation
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/d271b90d92c5e13.pdfIn PDF document text
    • https://gulojisaxedux.weebly.com/uploads/1/3/4/5/134598876/gofefuvasam_nuvemulako_lubopone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fd7b3ff77aac.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/db4194ada4fb96.pdfIn PDF document text
    • https://jowewuxutezu.weebly.com/uploads/1/3/4/6/134632231/5991708.pdfIn PDF document text
    • https://lisefemibumosu.weebly.com/uploads/1/3/4/3/134339955/8659590.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/3836789.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/jafixinetigotuzoru.pdfIn PDF document text
    • https://senolotazafam.weebly.com/uploads/1/3/4/5/134597296/simuwedesuvafegofafe.pdfIn PDF document text
    • https://wedovaxebekusos.weebly.com/uploads/1/3/4/6/134634127/4141692.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/nasametab_xozigimib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_5f94e599433ee.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/f1a5c2d0-b0b5-4838-ab39-b711b75ec4f0/fofamew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fe30abaecd33182fe85c/t/5fc429eff3de5e49b5e84735/1606691312404/malemupekezawojota.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64ab9abaecd331846e276/t/5fcce0e7c00f007ceae772ec/1607262440818/century_21_nyc.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_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 5056 bytes
SHA-256: cf60f943c4a6a31cf8117b55ff76b089adeb00fb30d449bac70bc067a7524de2
font_01_sfnt_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 10716 bytes
SHA-256: ba0e7c24190b0f1cc4c000a3878e8b0b4cf0727fe6c917da9eb8a29d5b63fdd9

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