Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac25a98f5bd5d658…

MALICIOUS

PDF

66.9 KB Created: 2020-11-17 16:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 26dc132e295cdf9159bc1ab557cf0f63 SHA-1: 22814d68d66b0e89042b517c92c566d8ac171c53 SHA-256: ac25a98f5bd5d658770217b7f43883df52e6439b6046bec1356eff3751ff2fe8
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The heuristic firings 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly support this conclusion. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=pes+2013+uefa+avrupa+ligi+yamas%25C4%25B1+2018 In PDF document text
    • https://giwakatunu.weebly.com/uploads/1/3/1/4/131437107/dixatenebiw_lunagor_datuwa.pdfIn PDF document text
    • https://zajefepitav.weebly.com/uploads/1/3/4/2/134266194/tigurazut-kikowosuwupezud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5fad5ad5c8c01.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/kegoputazodumekam.pdfIn PDF document text
    • https://mejebogisoxofix.weebly.com/uploads/1/3/4/6/134606558/buleza.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/fc8d244d8e6.pdfIn PDF document text
    • https://jobipidamefoji.weebly.com/uploads/1/3/4/6/134696246/rekupozerozarinep.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/6665565.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/dukajevo/78058213490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aec97e-00a0-469c-b8cb-adeb9e07c399/chccs_calendar_2019-20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1465988-245c-411a-8798-b25f09484197/alone_in_the_madness_2_game.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/93135945692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c890f7ba-572f-42d7-97f2-785fd22f4fe3/watch_desperado_full_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/30380965696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d3216f-f2b6-49ed-ae92-f21d74473b08/sword_art_online_episode_13_alicization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b613454-5e84-47fb-833d-077a0eb31a7d/fort_atkinson_high_school_athletics.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_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 6100 bytes
SHA-256: 89f6cbfe0b222cbd22678e652ebac3e84d0554cfe942d1cce217e3b4969f7034
font_01_sfnt_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 11984 bytes
SHA-256: 5eb7d6f591abd5ea63a7b61b8d92a641868a87399c81924fcc8209401db967e4

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