Malicious PDF — malware analysis report

Static analysis result for SHA-256 f935a36a32caf34b…

MALICIOUS

PDF

75.9 KB Created: 2021-04-15 15:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e439c53a9208bd5e9f8dd32c6bdf0ef3 SHA-1: e1b38a4f60cacf9ac8d4806c29d11bf541a6b2d3 SHA-256: f935a36a32caf34b954ebfaa66b1b95fa88271961b31ce0d3cd212c7c72a261c
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text suggesting it is a lure related to firearm ammunition, directing users to a suspicious URL. The presence of numerous external URIs, many on disposable hosting, further supports a malicious intent 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://lozipotod.ru/strik?utm_term=best+ammo+for+beretta+a300+outlander
    • http://mp4.design/how_to_set_a_kenmore_sewing_machinexcb28.pdf
    • http://1xbet-sportstavki.fun/milk_and_honey_downloadk6d8y.pdf
    • http://sewonmedix.ru/31230941873rtblg.pdf
    • http://simopuvoramawu.mywebcommunity.org/13624223572.pdf
    • http://sadinexiwa.mygamesonline.org/dipapawusus.pdf
    • http://nuzarekuzugav.mypressonline.com/59328360948.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suvalomimo.atwebpages.com/levivufe.pdf
    • http://wugerubuvugox.myartsonline.com/dawododukapisale.pdf
    • http://paguxesij.myartsonline.com/weather_and_climate_activities_for_3rd_grade.pdf
    • https://s3.amazonaws.com/jidosatikim/how_to_do_log_on_ti-84_plus_silver_edition.pdf
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_53bd3d0686a14b47b648a3ec7bed4218.pdf?index=true
    • https://s3.amazonaws.com/jebokizez/blank_printable_calendar_template_2018.pdf
    • http://ximuxulizi.myartsonline.com/82701590088.pdf
    • http://bidusibebawuz.onlinewebshop.net/adobe_photoshop_cs6_tutorial_in_telugu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea74.bin
519d050d308e93cdc7e48a7cd4d83ed19a8bd917dd3958283088ca2721a3ab2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA74 5548 bytes
font_01_sfnt_off0000fd33.bin
4585a6ea07f2b664f76939c19b533c978793d317741a018021ded006ec8a998c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 11024 bytes

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