Malicious PDF — malware analysis report

Static analysis result for SHA-256 791d0409a71e4b3f…

MALICIOUS

PDF

73.4 KB Created: 2021-03-18 09:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a99c6f9f4bc8e3b9b8681624282d068e SHA-1: a20e43f858c65fe9c85e542ae69a25c9e9ee9fbe SHA-256: 791d0409a71e4b3fd53c6ae908e65ec5e8a56b4ae328ddc7cdd2fa1cadaf8b09
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through a deceptive lure.

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 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://jacksth.ru/strik?utm_term=maytag+top+load+washer+not+working PDF link annotation
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/zinos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366965/normal_5ff79de67ec42.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/jjhejiY/vavoji.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/djjFzEM/50105774655.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/jjhhjI3/volley_fire_poe.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/3025064.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/hcifiha/jasisawob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_600f59a15dbd5.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/c2a364c90c92.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/f481455f90.pdfIn PDF document text
    • http://metilukizitase.iblogger.org/hunger_games_tome_3_gratuit.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/af98b67a-63d1-4a4c-894d-9f5b9fb77925/rijezerofatoxino.pdfIn PDF document text
    • http://pugegexu.rf.gd/5058395263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64cab29-3dcb-4f99-8ba9-79dd3e5caf08/52039674112.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/50095374964.pdfIn PDF document text
    • http://jemavavobeziv.epizy.com/amendments_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/52261174278.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/wetanuvaronelaxumitozim.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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 5484 bytes
SHA-256: 6ebd0eaeed674f3375b9b0c2be4519daaec44bf8ca792307797e3b480f03249e
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10452 bytes
SHA-256: d395eb9d77b5652f38b0dd852a2667e5fc118a00dcfb873f9d876bd5a088c128

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