Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72e18ce9108d4f7…

MALICIOUS

PDF

96.2 KB Created: 2021-06-06 20:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8aabd205d2b7a8fdcc3a0275d97201da SHA-1: e8370c884a480347bf100a5163a5f759362527da SHA-256: e72e18ce9108d4f71a914c4ee43048555a3c873f0d712534c444587a6ca4c002
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/pbw?utm_term=emanuel+swedenborg+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455894/normal_601703d7528b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_604162fa46dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_604ccae34b26c.pdfIn PDF document text
    • https://kefuvarunif.weebly.com/uploads/1/3/0/7/130739830/wufizigeguwawu.pdfIn PDF document text
    • https://narofuputukate.weebly.com/uploads/1/3/4/5/134585455/mebarogisirug-laregixafulotiz-wotofum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410204/normal_5ff3562c3e818.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/nejasi-motebifumezagur.pdfIn PDF document text
    • https://vuxamirajuka.weebly.com/uploads/1/3/6/0/136082549/vagikado.pdfIn PDF document text
    • https://ditezuni.weebly.com/uploads/1/3/5/3/135350757/zipipufuxewag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fd3b4716aa16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd0a101-b4df-4e5f-a63d-47756f908beb/foxoruvigavipolujet.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144414942/sijuxevoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879c84ce-9419-4c2d-aa0d-0f846d29377f/lidedebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24d77a1-d222-4a88-98b8-276e3d6e2bc1/acute_respiratory_distress_in_newborn_icd_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9807fd0-a593-489c-a6dd-0328ee366290/what_is_computer_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2165c246-db12-45db-88ed-5cdc3b4cdd44/41163254615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea153cfb-b80c-4e3f-bc5e-03fac60a6146/will_a_canon_printer_work_with_a_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2b9b71-d4ce-446c-b2b0-53dd8ee89b3e/how_do_you_use_cuisinart_ice_cream_maker.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/24342344697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ab9f6a-d4f4-49f0-b5e3-e01c49dda4a8/tujivoduxovelinasefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2d2bbd-c14d-44de-b7a1-28b359f3a54a/948229893.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144564033/migasexuxubolij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350a8e19-fa53-444b-bc0a-735db46add89/can_i_change_my_drivers_license_address_online_in_mn.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/f/66734991673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4380cce1-e5bd-40da-b4c9-0338f58a0157/libro_desarrolla_tu_cerebro_gratis.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144533508/30352296476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf07415-ff46-4943-b996-9961378ba7a4/winirevixu.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_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 5548 bytes
SHA-256: 45ae175e1bf636bde925a6d46bbc322b19c60f46e464a7f363e60958aeb39186
font_01_sfnt_off00014f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4A 10548 bytes
SHA-256: 3258bebdfa520c3636fd28805d5b4453928f2d12052e4570f86da81aeb094d45