Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d9a9f3c8139098…

MALICIOUS

PDF

76.5 KB Created: 2021-02-17 09:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b64c54c7a0695d758f6641a1422c9170 SHA-1: 9f44c4b4af543a51ec1fb1f81291435c8bdfef32 SHA-256: b0d9a9f3c81390989fb2d625984c938c2d47ec5146e9f71ec15ba2d0a23cfa27
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'one syllable words list' and 'wkhtmltopdf', which appear to be lures to disguise the malicious nature of the file.

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://druttle.ru/wix?keyword=one+syllable+words+list PDF link annotation
    • https://gixebodaloru.weebly.com/uploads/1/3/1/3/131379223/fekivop.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/xaxenusadelagedupavurede.pdfIn PDF document text
    • http://axecheat8.xyz/catris_merge_cat_kitty_merging_games5eevx.pdfIn PDF document text
    • http://betaxosenomagu.iblogger.org/surah_mulk_complete_image.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/8gcjhhh/how_to_loot_pin_pull_apk_download.pdfIn PDF document text
    • http://meinekarten.best/fivaguduxagoraruno8s3yt.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/xupamugezakuwa-jirebobomivi-zasutatefosok-gemipuwoxikol.pdfIn PDF document text
    • http://phillipen.online/51302997714ipwo9.pdfIn PDF document text
    • http://levelupguild.com/14809892200xympi.pdfIn PDF document text
    • http://gejobukopap.iblogger.org/99035967714.pdfIn PDF document text
    • http://novedexezenel.66ghz.com/vigijoxafazanijiwarukemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofekid.epizy.com/what_is_the_best_height_for_a_table_saw.pdfIn PDF document text
    • http://demajipo.rf.gd/42897310017.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/80080142729.pdfIn PDF document text
    • http://xerozovurewafok.epizy.com/nepunumovazavafasej.pdfIn PDF document text
    • http://pumiwusidura.epizy.com/dizedevokorugebulo.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_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 5180 bytes
SHA-256: 098212add96586291cb5f1fa2f81eae0e155429ad86ff65ba5f96700d41c4a17
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11148 bytes
SHA-256: 53d991fd1a2db159ad946f98bac6ad63ddaa5506f7c1ac0b9d758eebc3ab8ad1

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