Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe31a2db0c162c8…

MALICIOUS

PDF

73.4 KB Created: 2021-06-04 10:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ce1d5bda9bab3553f9be87c3050257f1 SHA-1: 460e63825c967acbb2521bede2ae247eef39940c SHA-256: dfe31a2db0c162c8edcff3de1ec9fa52fd6fe9fae8a6de0dfefb296c31651978
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam campaign. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://drafthe.ru/pbw?utm_term=pictionary+ideas+pdf PDF link annotation
    • https://razesupimo.weebly.com/uploads/1/3/2/8/132815812/xijedonebenopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_60327234d4aac.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/437582.pdfIn PDF document text
    • https://fosakozetabu.weebly.com/uploads/1/3/1/4/131483491/129265.pdfIn PDF document text
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/ketefenidepilapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_6041959dea0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_601311c7ce979.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/6968abf.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/e20322.pdfIn PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/lojolaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5ffcc40ba8103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_605404dc92da3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwolufit.pbworks.com/w/file/fetch/144566793/1000_aces_dice_game_rules.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/how_long_do_you_bake_lasagna_in_a_convection_oven.pdfIn PDF document text
    • http://pimepovume.pbworks.com/w/file/fetch/144480657/bricks_vs_balls_breaker_mod_apk_unlimited_money.pdfIn PDF document text
    • http://wenitat.pbworks.com/f/76462577978.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/35167530551.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144507636/75659076390.pdfIn PDF document text
    • http://natetusiwuwo.pbworks.com/f/aqualink_rs4_owners_manual.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/what_is_the_definition_of_retained_earnings_on_a_balance_sheet.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/math_minutes_7th_grade_worksheets.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144428550/fundraising_thermometer_graphic.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 5220 bytes
SHA-256: 772a2dd5d6309b32dd64c6059496ab225b9a7eca8611119b2834012ddb738967
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10204 bytes
SHA-256: 0656943667f7de4c8f2aa803afdee776f34701d6493c213b1091bb301e33537e