Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e4889b707b5ab6…

MALICIOUS

PDF

77.0 KB Created: 2021-03-10 01:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e20acc3b5c93d21418129e2c0c771669 SHA-1: 94120b13eb3f9b9473d68a3e798fcf155acd5382 SHA-256: c4e4889b707b5ab6247c0eea18ee7da125b3ff508cf72c755b565e59d73cd607
186 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 0.9998

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://lozipotod.ru/strik?utm_term=why+don%2527t+students+like+school+book+summary PDF link annotation
    • https://cdn.sqhk.co/pixorikibam/hwijicW/57436116791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5fde664812875.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/idjcLhb/samsung_security_policy_prevents_installation_of_this_application.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/dYTmjdF/cross_wallpaper_for_desktop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407100/normal_603b90709a936.pdfIn PDF document text
    • https://cdn.sqhk.co/gimovitax/eqgfiiD/eyes_scary_thriller_creepy_horror_game.pdfIn PDF document text
    • https://dedaxetodopifo.weebly.com/uploads/1/3/0/9/130968947/mageroluxajexidowizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fffff3dbfec8.pdfIn PDF document text
    • https://wexisuteki.weebly.com/uploads/1/3/4/6/134616275/1369600.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/UrRp0ba/89456113118.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/hbghjik/free_download_my_talking_angela_without_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/uhbl7hd/88831457735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_601c8963e05c4.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/jGKjjji/gegopaxinukeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_907844b5d6964f40bd4296b5bed8eb62.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_4a168e877b894cc78b94823464c8f3e0.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_46791e8e1e3248128bd88752ea800d9b.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_095a50d2f9fd41ceaf7f41668478fc08.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_8c0c470987ca49bd904d9a1ad88790ba.pdf?index=trueIn 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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5532 bytes
SHA-256: 007b79f193b52975f9b7826437b747985b468dc00a95d7ec56ac94552d629ef6
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 10216 bytes
SHA-256: 829656d69d91a65e3d52f4b6aae801d2a1c119b3fd4984f0a52095f12624715f

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