Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a99b3df02b7cbe…

MALICIOUS

PDF

63.6 KB Created: 2021-02-14 04:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d522c2726070c361958dcd32de04705 SHA-1: d8aacea086af08c79e8aa1dcef61642239e081d1 SHA-256: 51a99b3df02b7cbeb24aafdb1286c1909d5c55b43540012f50ed347d531e19de
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to disposable or suspicious domains, indicating a link farm designed to redirect users. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=essentials+of+managed+health+care+6th+edition+pdf+free In PDF document text
    • https://cdn.sqhk.co/kavonalitego/gX4yjfe/lobster_trap_art.pdfIn PDF document text
    • http://kameregeperiwaz.22web.org/midadedutexugamawosuret.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/giHxjNW/infamous_game_series.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/eye_catching_backgrounds.pdfIn PDF document text
    • http://sebotad.iblogger.org/afterlight_free_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/jhajbXH/mcintosh_speakers_price.pdfIn PDF document text
    • https://merogowaxoku.weebly.com/uploads/1/3/1/0/131069891/golenazodina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff8d7b92270f.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/hZLifGH/33876520958.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/ibhe5Np/57168337770.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/wVcwidt/snakes_on_a_plane_meme_generator.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/8f3f174c435c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugafazeporose.epizy.com/game_tekken_8.pdfIn PDF document text
    • http://wivonubezur.epizy.com/ableton_live_printed_manual.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_off0000bb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1A 5680 bytes
SHA-256: 7a6e6d8bdf8932c1636e8e62fb9fe9a1c27158874973f792244c6c5288de57bb
font_01_sfnt_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 10340 bytes
SHA-256: 48e86729126d7aef2e1ce47e8822f525703ee4f30003feb50b351e7486289570

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