Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8b0413ecc7e215…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 12:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac0c968b7178e0318c44c347f40e7141 SHA-1: c0dd5ce7d40f856819addba7bdd6e176a39171d3 SHA-256: 7e8b0413ecc7e2158fb67b77a79c262105873b24829db45deaa365e7c0e3a098
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=antrenmanlarla+matematik+2+pdf+renkli PDF link annotation
    • https://cdn.sqhk.co/tegatiwuwax/hagh2ig/new_comic_book_animated_movies.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_605bade09e249.pdfIn PDF document text
    • https://retinagarar.weebly.com/uploads/1/3/4/3/134319249/mosanubisugar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_605037645c1ac.pdfIn PDF document text
    • http://accface.in/rufewovaknhji.pdfIn PDF document text
    • http://detonic-hypertonie.website/pikiterigepitevi9an78.pdfIn PDF document text
    • http://autobaff.xyz/kasaj9dp5s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_600fa5287641c.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/ejglgdJ/killer_mike_monster_rar.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/jbCPhi6/fuzegakupobukobesur.pdfIn PDF document text
    • https://cdn.sqhk.co/nojenite/mXBijmR/google_maps_api_key_free.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/1874106.pdfIn PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/rutusitori_moluwegiratedom_piweteja.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/ca7Aqge/limbo_song_daddy_yankee.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/Ulghryp/fefizimumesa.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/kibuda_xurutekedefegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_60540761bb9f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_6008d816cc784.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/cMie7jh/48723873790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 5192 bytes
SHA-256: aa4ef77c8add7076073371fd90daaa718898632025b4e4e62b94135daea4c9b1
font_01_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 12212 bytes
SHA-256: e2374770697d544a22eaf0cbb17ee4ad8bde6a18f4fd48d000db005c66c79ba5

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