Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3c3b58e440fbed…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 03:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 12fc21a9598ea5edf4f8cfbea87f34f3 SHA-1: b1ea375667a6616efdb724732b7d2dd635654804 SHA-256: ae3c3b58e440fbed0583fd1c13b053e25c7b89126d2513453e7644e357300249
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The embedded URLs likely serve to direct users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=asus+mx279h+price PDF link annotation
    • http://deladinabixek.sportsontheweb.net/red_dapple_dachshund.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/RLijChb/gubesutexeven.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/74412429406.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/cycling_merit_badge_workbook.pdfIn PDF document text
    • http://kozugufasuroti.mygamesonline.org/historia_de_la_decadencia_de_espaa_canovas_del_castillo.pdfIn PDF document text
    • http://tiwilib.iblogger.org/13435083313.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/7hc6fhh/26447171535.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/g4KidVi/casse_o_player_pro_apk_no_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/ibtvIge/talion_shadow_of_war_voice_actor.pdfIn PDF document text
    • http://zawirimo.22web.org/masevubalimapoze.pdfIn PDF document text
    • https://cdn.sqhk.co/luwanuriwaba/2Uigkge/bukelasobalaxopemakivu.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/gdiKbhi/nuxewawov.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/ihhdBic/wajazojaxinogofu.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/pregiic/94838335780.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/Ciy8uhf/star_fruit_harvest_time.pdfIn PDF document text
    • https://cdn.sqhk.co/zojudaje/w26jepX/download_clumsy_ninja_1._6_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/dnVggVy/ates_ve_su_4_indir_ve_oyna.pdfIn PDF document text
    • https://cdn.sqhk.co/lipisowonili/f8fjche/short_answer_translation_french.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_174e26ff598b4432bcf1ab862254b505.pdf?index=trueIn PDF document text
    • http://zijedan.atwebpages.com/63241076254.pdfIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_676117efca8942c688b4ae127021acb7.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_3d180974eb7f413b90e67c856fdc5e46.pdf?index=trueIn PDF document text
    • http://futuwerelak.epizy.com/27942525560.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_d0908125a9924fb49fa6d559fe3c740d.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_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 5356 bytes
SHA-256: 40525c3da172fcbc46c1b2b235b31d67a01bafeb4e1fda59ba798e9b1ba76f79
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 10728 bytes
SHA-256: 920176fce2dee679a3fa7893a2981f39d1e45f5cf1fc5e4a85482596680671e1