Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7e79da1783c76f…

MALICIOUS

PDF

81.0 KB Created: 2021-02-27 02:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bf737133b27f8da4c4320958463fae02 SHA-1: 07159b9fde5d67f45429cb8016c1eb8d676eaf67 SHA-256: 4b7e79da1783c76fe401809ee607f00fb223095414c380c229ef4b074090243c
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 external links, many pointing to disposable domains 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 malicious document designed to redirect users to potentially harmful 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://jacksth.ru/award?keyword=why+would+my+car+alarm+keep+going+off PDF link annotation
    • https://cdn.sqhk.co/vekuperik/geGcNUM/25299943725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_601edd11d9a64.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/mjiiijw/tekegikaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493881/normal_602de9dd94fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/fjgDsYh/58771286447.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/play_family_feud_fast_money_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/isk24gj/31450555733.pdfIn PDF document text
    • http://filanion.online/zuropugibe394pw.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/jdgKOEF/stick_shadow_war_fight_mod_apk_home.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/dateline_the_other_side_of_paradise_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/Jvgfi75/used_drum_set_for_sale_in_sri_lanka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_60287b2853119.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/f0gfggi/maze_runner_book_vs_movie_similarities.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/82845379543.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/gfHHHb1/nanonojavipubumowev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5fcdc9f03bd9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fdeaffe9aef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limoxukuk.atwebpages.com/kosukapulowimafibaj.pdfIn PDF document text
    • http://pazepoxi.atwebpages.com/samsung_xpress_c480fw_toner_yellow.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_off0001002f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 5660 bytes
SHA-256: 7f659a823edead80272a2ab454b411fef001a53acc4127d84743ee9e9817963b
font_01_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 10244 bytes
SHA-256: a111ba2295e7a59bd8206e81ee300b0cc9d4e68ea62f994dd6061694d7f37e92

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