Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5a195b09a79a61…

MALICIOUS

PDF

79.1 KB Created: 2021-06-09 08:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 93e1ce53f4183d14ce5e585cec3479e4 SHA-1: e1715ab83eb65aeac2518e7d0755eb47c0bad59e SHA-256: 5d5a195b09a79a61e0a7c24364ddf952c4bf39ea6d90958b857c78f80c418be3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the primary attack pattern involves directing users to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/pbw?utm_term=definition+of+conical+pendulum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6056a491efb6c.pdfIn PDF document text
    • https://totixibepetuter.weebly.com/uploads/1/3/4/3/134345693/waxofopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_601a8401d58e4.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/zirigeroveko_nitewekawezufaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_60be42f17c18b.pdfIn PDF document text
    • https://bokojisegozesu.weebly.com/uploads/1/3/4/4/134479890/nakas_rizafabojo_vokazobunebuv_lidakegoxitamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_602c32e0b389d.pdfIn PDF document text
    • https://gajorimimexawi.weebly.com/uploads/1/3/4/4/134458849/nutefepozosul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcb5ddc2204d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_605a2679182b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_600cb6888e654.pdfIn PDF document text
    • https://katutufoderosut.weebly.com/uploads/1/3/1/4/131437544/ff7810e98c2421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_603ed4bbdb291.pdfIn PDF document text
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/f57c735.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fe46a1623ee0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/f/how_to_hack_someone_cash_app_without_human_verification.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/zifuxekug.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144663828/what_can_i_say_instead_of_opportunity.pdfIn PDF document text
    • http://juwelite.pbworks.com/f/jazejejereladazamutapo.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/gta_san_andreas_cleo_mod_download_free.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/f/72674462968.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144545859/30081753860.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144917700/womagadajafo.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144488184/ice_age_3_full_movie_in_hindi_download_pagalmovies.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5024 bytes
SHA-256: 1fa2afe597465753fe9e1cc137a71127ebcd2b510d0accc4c71778fcc8440a31
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 11572 bytes
SHA-256: 05b48003c467e7b6caf71568c2970601040caed9cbbe7ce347cabb45de88ff4c
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb