Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e79f678faf8196…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 09:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bea7e9043a416589a6bf6c99888f38e SHA-1: bd2840316a8dbe1e57c8fca29f3a46d5234130ab SHA-256: 18e79f678faf8196c15cab78bbbb6460da89c82f9717eb56229cfed570fe2233
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'offline battle royale games' and 'apkpure', suggesting a lure for game-related downloads.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=offline+battle+royale+games+android++apkpure
    • http://getsol.xyz/porter_cable_16_gauge_finish_nailer_fn250bsvo3d.pdf
    • http://mukinumatonewo.getenjoyment.net/hp_photosmart_d110_cartridge_problem.pdf
    • http://mavpa.fun/13450303099hqjmq.pdf
    • https://static.s123-cdn-static.com/uploads/4467027/normal_5fdef87d19739.pdf
    • http://vozobatenaw.mywebcommunity.org/83924445633.pdf
    • http://capridigi.com/the_way_we_eat_now_book_reviewmv5cc.pdf
    • http://firstdoctor.xyz/61526318652xcrmi.pdf
    • http://helpcreditscore.info/80067081482wq4kn.pdf
    • https://cdn-cms.f-static.net/uploads/4393635/normal_6013620d27e83.pdf
    • http://gta-msk.ru/best_bp_monitor_for_large_armso8qjw.pdf
    • http://tufofol.medianewsonline.com/velisaritadezupipedewi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://titugol.atwebpages.com/sunbeam_water_cooler_ylr2-5-90hz3_manual.pdf
    • http://jeximojela.myartsonline.com/dizexexubevuvev.pdf
    • https://uploads.strikinglycdn.com/files/da5933db-c456-41dc-b9ad-6d6e71c56e12/72714968120.pdf
    • http://movuzawizigevej.myartsonline.com/printable_parent_contact_log_for_teachers.pdf
    • https://uploads.strikinglycdn.com/files/5c755814-fc15-4336-b40d-8ed630e0373d/zefoketutuwenonifuxi.pdf
    • https://uploads.strikinglycdn.com/files/fcd4b631-9ca2-48c0-8c53-b592d3ffded9/puxagolof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin
d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 2952 bytes
font_01_sfnt_off0000ef4a.bin
e271bb43ce94f28c4d6ed8982d09080dfddf657819a11144c0240ed7f04591de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 5696 bytes
font_02_sfnt_off0001029a.bin
9776cfb64159db7db68df0157bc0c9d29eddbb91e6977e5dd189b76c1f22f587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 23452 bytes

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