Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e72e26184ffa54…

MALICIOUS

PDF

84.2 KB Created: 2021-01-18 11:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df81a9eb6ccd34ac45f547f3fd0a7690 SHA-1: 6e26e23a1bb9890317cb1277e9268b8c87bd8e52 SHA-256: 17e72e26184ffa5471833d7daf0f3accffdad2409ce50d12aec82e9da88da56b
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://bologen.ru/aws?utm_term=kendo+grid+autocomplete+column+template PDF link annotation
    • https://cdn.sqhk.co/gulifunanale/djbOiiU/navojewidojibewo.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/ja1her9/ligepoda.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/lidq7qN/gardenscapes_online_game_play_free.pdfIn PDF document text
    • http://metinozub.iblogger.org/96831994772.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/Mgekjid/dropped_ice_cream_cartoon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5fb37e81d1b5a.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/Ehgibid/ocean_island_survival_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/Ibiiegg/paradise_island_bahamas_resorts_all_inclusive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5fae9d2e751c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5fed60fcf00c6.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/jaYih9w/student_beans_discount_code_isawitfirst.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f9117937581c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/columbus_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/bcbs_of_michigan_drug_prior_authorization_form.pdfIn PDF document text
    • http://wujasulo.epizy.com/bree_serif_font_family_free.pdfIn PDF document text
    • http://vezoxonu.epizy.com/kmspico_activator_for_windows_7_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/96447209025.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/castlevania_aria_of_sorrow_soul_collecting_guide.pdfIn PDF document text
    • http://tatefes.rf.gd/89053050005.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/8394667343.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 5184 bytes
SHA-256: da93e0340ee1f406119e0cee00239d388c8ad52b7c36af8ff103bceb82c565ef
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 6520 bytes
SHA-256: 32358e11195b7bc74dc69b1ec77337797b27d2319967fb2d51345f7f977fbe63
font_02_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 12612 bytes
SHA-256: 1cb554f97a955ab42ec514b977e7fca503308b5768fe76411555eb52aa6484cd

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