Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d435528c58fda3…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 16:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ae9e6a8ec9d4b67b57c159eb367ac079 SHA-1: 2f7ae9d0b5471f84066aebb7cd27dbd2d6d25895 SHA-256: c7d435528c58fda3690fe852cd616a713df4a5e7992d1241106bc684f595a6e6
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 pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of numerous URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics indicate a high likelihood of malicious intent, possibly to redirect users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable.

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://gimoguvi.ru/123?utm_term=teaching+speaking+skills+pdf PDF link annotation
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/vagodeten.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/nouns_lesson_for_grade_3.pdfIn PDF document text
    • http://testvvd.xyz/pa_cosmetology_study_guideinjxw.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/the_7_laws_of_spiritual_success.pdfIn PDF document text
    • https://tuvugeti.weebly.com/uploads/1/3/4/1/134108896/pivodote.pdfIn PDF document text
    • http://lg-copyright.com/sports_board_games_facebook514ez.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/sukud.pdfIn PDF document text
    • https://lopiranurepo.weebly.com/uploads/1/3/4/7/134735856/taporax.pdfIn PDF document text
    • http://zenelis.iblogger.org/73332614204.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/rusazub.pdfIn PDF document text
    • http://distornyup.site/scientific_principles_of_strength_trainingvtkpa.pdfIn PDF document text
    • http://gufutaca5.xyz/vuvomafoxopuwawolakoxa60g.pdfIn PDF document text
    • https://tulopesonu.weebly.com/uploads/1/3/5/3/135318186/ketolipenisenoxewud.pdfIn PDF document text
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/29f3503f.pdfIn PDF document text
    • http://nuvekediporere.22web.org/firex_hardwire_smoke_detector_with_9-volt_battery_backup_and_front_load_battery_door_6-pack.pdfIn PDF document text
    • https://xadafujivesa.weebly.com/uploads/1/3/1/3/131397927/2917458.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/sofamasupuno.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/9958211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kagokonutuvep.epizy.com/internal_auditor_report_to_audit_committee.pdfIn PDF document text
    • http://vazegazu.epizy.com/who_invented_electric_bulb.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/arthas_guide_hots.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/8791732660.pdfIn PDF document text
    • http://rimutapewite.rf.gd/pirivafomebemetep.pdfIn PDF document text
    • http://lexamokoxerum.atwebpages.com/sipuwufepavafuvadovuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/extending_the_linear_model_with_r_second_edition_solutions.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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5336 bytes
SHA-256: ccf841de81081a0053522b9e0d4eb85024a6521eb0522dcdde3b0a497085a512
font_01_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 10652 bytes
SHA-256: 8e3ceffac7ede1f5cde07918d68fd15b1b3e22417bfc4b18bd57face18a19662