Malicious PDF — malware analysis report

Static analysis result for SHA-256 e359143312e3b942…

MALICIOUS

PDF

84.6 KB Created: 2021-03-30 20:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49ba91505008faf2f414097fbee78567 SHA-1: d968b3b016ecf88d3edc420febca076ac2c061fc SHA-256: e359143312e3b942d465a05cf2de6f259eec168e9a5443a3232abb5786067672
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a large external link farm and a high ML score. The presence of numerous external URLs, including one pointing to 'kuzutuzo.ru', suggests a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure itself is used to host these links, indicating a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=graco+pack+n+play+sheet+dimensions
    • https://bopovajo.weebly.com/uploads/1/3/5/9/135966354/2685023.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/jepomusuxodimi.pdf
    • http://poxumanavofeboz.scienceontheweb.net/step_3_results_date.pdf
    • https://guzarederojem.weebly.com/uploads/1/3/4/3/134392385/duparitidodives.pdf
    • https://dezekebewefe.weebly.com/uploads/1/3/4/7/134731304/6b9139779a0e.pdf
    • http://gazeloguxa.22web.org/chamberlain_liftmaster_formula_1_program_remote.pdf
    • http://suvonenexazu.mywebcommunity.org/jutekoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/farowug/letter_from_birmingham_jail_document_analysis_answers.pdf
    • https://uploads.strikinglycdn.com/files/26d77324-e0dd-45eb-91c8-478fb773e8ea/57097857287.pdf
    • https://s3.amazonaws.com/loxopudizus/15116883884.pdf
    • https://uploads.strikinglycdn.com/files/d6f4153a-8f15-46c0-aae0-12ea5c578bdc/84537498180.pdf
    • http://zananus.rf.gd/kisadibijutet.pdf
    • https://s3.amazonaws.com/dobikasukavu/how_much_does_joist_app_cost.pdf
    • https://uploads.strikinglycdn.com/files/95826b3b-f430-4ce3-a943-f109603c2940/how_to_fix_petsafe_collar.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/zetojemajijudejapapiwaluj.pdf
    • http://tiwojojerat.rf.gd/bootstrap_form_search_field.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/falling_slowly_vocal_sheet_music.pdf
    • https://s3.amazonaws.com/musokejixami/lonelaliramog.pdf
    • https://s3.amazonaws.com/jopomodilamego/xijanutozusovonuf.pdf
    • https://s3.amazonaws.com/boxalewijim/wigizumujoralabudob.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_off00010862.bin
ff5f97bc7cce9f72a8208b5afc65a5588b1742fab24db3ec157a818321a27d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 5508 bytes
font_01_sfnt_off00011b01.bin
b12e7ffd6ffbdacbce0cece9308aa9d5211c5cd5f96cf68826a3c8443b469d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B01 12084 bytes

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