Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e8b39d235f416c…

MALICIOUS

PDF

83.4 KB Created: 2021-03-15 20:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 35d753cda4de2f48f2ae4db46d1dd6c4 SHA-1: 5d1bd6a506b0ae0b040bd9a0bcea151c6f359661 SHA-256: 82e8b39d235f416cca5761dcc34a4c1e6574d2a6b0e5b97e63ea2721efcc2dc3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=transition+words+for+closing+paragraph PDF link annotation
    • http://com-servers.online/zelukermsg8.pdfIn PDF document text
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/duwinerutopa-mibuti.pdfIn PDF document text
    • http://natorg.fun/dofetitesigoruxukuk5e45.pdfIn PDF document text
    • https://cdn.sqhk.co/bitulore/9gXdjdG/wood_carving_chisels_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/gzQfSgj/77905289497.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/alggjfo/magujezitikovus.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/wegefegez_genoxofazax_fijinewi_bikebugujizi.pdfIn PDF document text
    • https://cdn.sqhk.co/poxudanefisi/hc3wgez/xufaduju.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/iayjhhd/41645842951.pdfIn PDF document text
    • http://smeshnoykir.space/basketball_buzzer_sound_effectyn8mv.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/z6hhjjq/rush_hour_2_godzilla_quote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fc5cb4b853fc.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/bojifac/11302013838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_604f819a05dcd.pdfIn PDF document text
    • https://foluxodemebomo.weebly.com/uploads/1/3/0/7/130739593/8684843.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/restriction_orifice_installation_guidelines5v4ji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5fd7c5f8664d1.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/hhiSDh8/66879266561.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/jigadulumi.pdfIn PDF document text
    • https://cdn.sqhk.co/xamevetap/lugjiho/pardesi_babu_movie_songs_free.pdfIn PDF document text
    • http://iclod.tech/fanaa_movie_all_shayari_videos9uth.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/i0iijgz/jilas.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/1407747.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_ea57166cab2b4c508893a0d3f4fee00a.pdf?index=trueIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_41e3040d0a5c4676905ab1847300d815.pdf?index=trueIn PDF document text
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_f210eafed3db4d05856cceb553b4f0c8.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_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 5456 bytes
SHA-256: 87947786466790376756160b935ce3f99a6537d68684465516f4dc7b8b2ecb99
font_01_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 10584 bytes
SHA-256: 13429e941e2e0ce0f60d841079e4853682255570ffe1718b9d2f6134068b0370