Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac32b32d0666f9d3…

MALICIOUS

PDF

82.9 KB Created: 2021-04-04 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 10eaf821da00153f78200e08bbd78d75 SHA-1: bb4cd9bd6829a58afa581a10bcfdeb563a3bb7ab SHA-256: ac32b32d0666f9d335da785bfd871791903004c81423b6b2949ceb4404d89ba9
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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/123?utm_term=bekhayali+lyrics+song++pagalworld In PDF document text
    • https://cdn.sqhk.co/rajemaramiw/iYggjja/42524921432.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/oh5iiRz/pitimajivuvirifeva.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/aUOEzVO/power_rangers_all_stars_new_update.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/ezjdU83/bike_racing_3d_online_play_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tozijizubu/X7je7id/miwiwarasi.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/NCaQiga/lyrical_video_status_maker_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/hbgegiJ/police_auctions_near_me_online.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/d2b685d9a1cfb27.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/idicigc/jegib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_600eec63f2634.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/YPHhcij/movie_quotes_quiz_1990s.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/whhjfjc/gulovof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369310/normal_5ff7bfabf03de.pdfIn PDF document text
    • https://cdn.sqhk.co/jumunuji/fjNgeib/scorpio_woman_leo_man_yahoo_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_606229d1cd762.pdfIn PDF document text
    • https://kagifinozadobet.weebly.com/uploads/1/3/4/9/134902547/6849240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_605d8c339d944.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/2392724.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/oWRWN2g/vagixase.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/jjp3ugi/76121749097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://takerowul.epizy.com/blues_piano_chord_progressions.pdfIn PDF document text
    • http://kevowuju.rf.gd/fonuxivogusufef.pdfIn PDF document text
    • http://fariwugakek.rf.gd/wobatitidano.pdfIn PDF document text
    • http://lazubag.epizy.com/nursery_rhymes_in_english_free_download.pdfIn PDF document text
    • http://reronagut.epizy.com/sanyo_rice_cooker_3_cup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 5348 bytes
SHA-256: 836635753c8f1d5477218d34ee21ddc9229aa1ead108e28a1c3c0ae35e3969cb
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 11112 bytes
SHA-256: 1297f84c435ac666e1e20c001769a2efc5980b56bc283fd1099dac5a2029adfc
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378