Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5263d95e8f93897…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 05:53:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7305e31fe5b0c4847111a531c6f16a62 SHA-1: 757b7b0719f994eb2ff9f2dcd3f55ace873a5345 SHA-256: a5263d95e8f938976ae7f0e1c9c6cf87e0147a85b4b748c963d095b1ac225a95
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=cg+hd+video+song PDF link annotation
    • https://cdn.sqhk.co/ragonujip/hhierGk/sims_4_jungle_adventure_temple_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/gaR9Chh/birth_certificate_akron_ohio_address.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/e2BhXef/zombie_street_fighter_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/DQwicjg/860408758.pdfIn PDF document text
    • http://tarizuxewibob.22web.org/xajavadaxufukasatavin.pdfIn PDF document text
    • https://nozugaxuxanukuj.weebly.com/uploads/1/3/0/8/130813784/8431673.pdfIn PDF document text
    • https://cdn.sqhk.co/xituvusaw/EEJDiez/34214595056.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/pafuz-petiget-godibaboposugi-futifededo.pdfIn PDF document text
    • http://jupazisu.iblogger.org/is_walking_enough_exercise_while_pregnant.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/cirrose_compensada_e_descompensada.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/eLqjgjh/pixoxiwoli.pdfIn PDF document text
    • http://jazesenebadajak.iblogger.org/favom.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/VhhPidJ/39675135743.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/1261f36bfb.pdfIn PDF document text
    • https://mamumudud.weebly.com/uploads/1/3/0/8/130814078/1005830.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/RaijHVj/dizividilig.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/0318fa.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/korejof_mekikepamixed_piwemugedeleb_rekisiwirija.pdfIn PDF document text
    • https://lekevemu.weebly.com/uploads/1/3/0/7/130776436/0eec4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pokukalaso.rf.gd/what_are_the_five_elements_of_scene_design.pdfIn PDF document text
    • http://xuxidiso.epizy.com/john_grisham_release_date.pdfIn PDF document text
    • http://pakebojubo.rf.gd/46096160904.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_off0000f019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF019 4716 bytes
SHA-256: 3bd072927018aa504ea861dba9f58e6f6e48d2365b7761a3fd9dbc9a1c7bb54b
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10920 bytes
SHA-256: d49ef72e3a22ea7652b8a8b2fe84fb303c16d14c7607e0ac3f64f81f10705f0e

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