Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7cd578c925baf1…

MALICIOUS

PDF

78.7 KB Created: 2021-06-12 07:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a4e22e742305947e84cf6afebfa8c78 SHA-1: d7bff6ef6a81266a0db282f42778cf9ab973c607 SHA-256: 7b7cd578c925baf10e88f760851ea4a48d9acafc84d2146e0b8fe4d3dd9367a2
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with a primary external URI pointing to 'https://queure.ru/pbw?utm_term=rick+and+morty+dungeons+and+dragons+review'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/pbw?utm_term=rick+and+morty+dungeons+and+dragons+review
    • https://cdn-cms.f-static.net/uploads/4464995/normal_6031238e76fa4.pdf
    • https://zuxolizaf.weebly.com/uploads/1/3/2/7/132740519/8757666.pdf
    • https://zetofenudewizir.weebly.com/uploads/1/3/5/3/135308120/6412777.pdf
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fcc0c7595464.pdf
    • https://static.s123-cdn-static-d.com/uploads/4445729/normal_60b78c4b3a38c.pdf
    • https://dixatobuvug.weebly.com/uploads/1/3/5/3/135321084/3415692.pdf
    • https://cdn-cms.f-static.net/uploads/4404723/normal_601a0b63ad278.pdf
    • https://cdn-cms.f-static.net/uploads/4387428/normal_6014692618bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4408478/normal_602ae05a7b0c7.pdf
    • https://static.s123-cdn-static-d.com/uploads/4368951/normal_60b561b9601c5.pdf
    • https://cdn-cms.f-static.net/uploads/4505358/normal_5fe9a33797997.pdf
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/bozexisulow-gozuzasuvejuded-rozike.pdf
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/vidosovogimifipivoda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wuvebag.pbworks.com/w/file/fetch/145042698/vlc_convert_dav_to_mp4.pdf
    • http://voveras.pbworks.com/w/file/fetch/144907368/62363671134.pdf
    • http://natetusiwuwo.pbworks.com/f/jibebasav.pdf
    • http://juxivos.pbworks.com/w/file/fetch/144801141/i_want_you_back_lyrics_chords_jackson_5.pdf
    • http://popuwepux.pbworks.com/f/groovepad_full_apk_mod.pdf
    • http://nijosifa.pbworks.com/f/66437830468.pdf
    • http://javefanudosa.pbworks.com/f/gojapiwinu.pdf
    • http://zopujoxobug.pbworks.com/f/niludit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin
fe852763a6b4432dd98d6ca045882e582377c80dbc844fd6484315a53910bf67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 5436 bytes
font_01_sfnt_off0000fa08.bin
d66a3332f2a8783bc6cbe165b01b82e70f4094ccfc36ccf8de3a78e6ef496351		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10996 bytes
font_02_sfnt_off00011f81.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 4324 bytes

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