Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9cd29ee7702af8…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 00:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f63052a30ec71a03cb0cefb5c9e8535 SHA-1: 40701bfee95c9cc46cde6691032c8aa5b52c7a9c SHA-256: 0f9cd29ee7702af8058b4b1f093c1c8ca8d3c160963813b94afaa9c8c7a53dc4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, pointing to various domains including 'soxebez.ru' and 'cdn.sqhk.co'. Heuristics indicate this is a phishing or malicious link farm, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm and phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/123?utm_term=wrestlemania+bleacher+report+grades PDF link annotation
    • https://cdn.sqhk.co/zogowefu/XBiehbP/32634376551.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/dtzjHhg/36660518576.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/6xKvLgi/xanokebixulatipizuxewat.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/ajihbge/miguwezumaziziwilosesu.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/phccQi7/does_monkey_grass_bloom_flowers.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/Thgjii9/how_do_i_use_chase_mobile_wallet.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/aidclij/67915986779.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/roxelodamil.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/jfhighr/swingman_jersey_lakers_purple.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/jghjUii/stranger_chat_mod_apk_unlimited_stars.pdfIn PDF document text
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/700549.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/Uhegdib/birdy_movie_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/PjegjHX/44018250850.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/luzalijexagaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/f2hajgL/59871085257.pdfIn PDF document text
    • https://cdn.sqhk.co/soredepel/fhajcig/62095563014.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/jejdiKp/black_and_white_pictures_of_basketball_players.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/gdifcjc/18169602931.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/fggjdgh/geden.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/diebAhW/xuselusujuliluwodivut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_264e26f1a6c345e39e5e4f83df2a9551.pdf?index=trueIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_38460683d3c5419a8ff38daae1e08f64.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_a2ef3b5deaab449581f2b875782de02e.pdf?index=trueIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_5e284e4dae504203a3695af38d73c30d.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_cb4c62e2505049fe9d48b1a78172a195.pdf?index=trueIn 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_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 5640 bytes
SHA-256: 5fa4042f7bf71f780689b92b8861b6c0b794e048a676baa2d00ee1ab8aeb8d62
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 10732 bytes
SHA-256: bd25668b62d6ec162ea9636caae0423cf688b78ec89235336b6094ab3ba4028a