Malicious PDF — malware analysis report

Static analysis result for SHA-256 90df5e9f06672c20…

MALICIOUS

PDF

69.7 KB Created: 2021-03-03 02:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8fecc73a7c75d294a7ff22ec8ed65685 SHA-1: 9c2f40f82bce55ca1a4ca1908fad42d1d48551c9 SHA-256: 90df5e9f06672c200f771c5ca73ad327b3e08b4db6c61ef40c484e8bbefa3308
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to an instruction manual, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=pressure+cooker+xl+instruction+manual PDF link annotation
    • https://gotedimonov.weebly.com/uploads/1/3/4/7/134761190/9019060.pdfIn PDF document text
    • http://lenemoloj.22web.org/bhagwa_rang_dj_video_song_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_602050b989655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5fec8add28fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_6012262dc1d52.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/jdJhhha/nuclear_weapon_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_600c65792f571.pdfIn PDF document text
    • http://itwow.info/summary_of_fuenteovejuna5jcfk.pdfIn PDF document text
    • http://myfirstsite.xyz/mcqueen_drift_cars_3_super_car_racer43pu4.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/jgj0KdU/vipitolixegagopowosu.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/9o9VieA/nick_jonas_movies_2020.pdfIn PDF document text
    • https://tixuxajus.weebly.com/uploads/1/3/2/6/132682254/5f421e570264fe.pdfIn PDF document text
    • https://cdn.sqhk.co/lixejudazeza/JTJjdhc/music_landscape_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/30032303219.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/how_to_make_a_paper_book.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/85184361496.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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 5080 bytes
SHA-256: c2ce255cb2d14af24bf154658f6770f8607bf880be9755a10eb978a7a6630871
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10228 bytes
SHA-256: 1eb1cf2e33797a9da0442c7527587097e5b4f5fa7a1622d42b84690538b517af

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