Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb381ee63d15c0c…

MALICIOUS

PDF

83.3 KB Created: 2021-02-24 20:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 91a9b76874445ed71d68e7169dd83f52 SHA-1: db16617ea1085050c361f1e16d7b48dbd35505ba SHA-256: bbb381ee63d15c0c3eafac2136ac4b8d0708ce3151d97d8be42e4bd42fbd5e83
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=nikon+prostaff+rimfire+manual PDF link annotation
    • https://cdn.sqhk.co/tolononof/e9geRBn/sekoza.pdfIn PDF document text
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/3983616.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/rafozogiduzuk.pdfIn PDF document text
    • https://jatufajikovuna.weebly.com/uploads/1/3/4/7/134719937/nivamal.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/b8hd5ha/download_army_battle_simulator_mod_apk_unlimited_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/aPFygdN/adidas_yeezy_slides.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ijbrsjB/multiplayer_shooting_arena_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/h1QW3hc/house_paint_colors_with_red_brick.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/muwekemonaxexofubumawik.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/3880529.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/hjMnRVd/ikea_maze_meme.pdfIn PDF document text
    • http://kolomakive.iblogger.org/katado.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/pinodonor.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/kafumajo.pdfIn PDF document text
    • https://kigotofu.weebly.com/uploads/1/3/5/3/135323523/32ea737c5df9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vilepobafomunow.atwebpages.com/dark_souls_3_guia_completa.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/how_to_assemble_shark_navigator_lift_away_deluxe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 4960 bytes
SHA-256: 0330655f6b3b3d55116b2657033164f7a49645904f93288e5dd18a8226611eaf
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10152 bytes
SHA-256: 311f54afa9f9b29c599daf8f9126f325547786ca4c485db252ad7e7e643ff41f
font_02_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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