Malicious PDF — malware analysis report

Static analysis result for SHA-256 39512465fd6fd188…

MALICIOUS

PDF

71.3 KB Created: 2021-02-20 07:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 48da055fa64dcbcec11591c22ca351f6 SHA-1: 646fe679f68e98ff672126a92b3e5a3ec550cdac SHA-256: 39512465fd6fd18880a462d6fd6f2fe48436dd38c06d728d3858b033c17cff66
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to deceive users or search engines.

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://crophysi.ru/strik?utm_term=hp+laserjet+p2015+toner+amazon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484605/normal_602ae3084e201.pdfIn PDF document text
    • https://cdn.sqhk.co/kewexezaviz/hesibMV/dallas_cowboy_game_tickets_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/konanetufuda/Trhidjj/horizon_hobby_rc_car_review.pdfIn PDF document text
    • http://bionatur.space/ferdinando_el_toro6sxmk.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/jdjckji/39532681538.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/aiiJidu/best_car_racing_games_for_android_2020.pdfIn PDF document text
    • http://neritam.22web.org/brother_reset_drum.pdfIn PDF document text
    • http://daxuzas.22web.org/xizafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fd18e1b293f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_603024dc4f828.pdfIn PDF document text
    • http://tegor.xyz/97792203783gimfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_602e38b30c66c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501789/normal_60166e93d9035.pdfIn PDF document text
    • http://regvoolkim.website/going_green_letter_templatec7cz1.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/hcjdrZa/xezinuzufin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/74418148586.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/portugues_brasileiro_para_estrangeiros.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/android_mobile_to_pc_file_transfer_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/kobew.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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 5504 bytes
SHA-256: 9c02b1791ae4cb3ce0cefb844d9f0f09de02ed77e6251d10914723ca740f5698
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10428 bytes
SHA-256: ca6d2a99f4c85e7b3f0c8f083e7ecf68ad8e574bc618c3ce7c1bc091f87df734

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