Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eef4ab47b1f0694…

MALICIOUS

PDF

83.4 KB Created: 2021-04-10 22:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: efb9458dfe5ebc4f25647a33d763b176 SHA-1: 6ac95ac61ea6119be4b6127563887fc8c6c0a693 SHA-256: 8eef4ab47b1f06946877bd63f9e65c242dd8ab6bfccfdbbb074557cd902fe519
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely intended to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=how+to+fix+printer+offline+brother PDF link annotation
    • http://gewututikame.getenjoyment.net/clasificacion_de_numeros_reales_cuadro_sinoptico.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/6ibeigN/80756798091.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/71523256846.pdfIn PDF document text
    • https://cdn.sqhk.co/riluvexudeve/k7gjie3/83038856476.pdfIn PDF document text
    • http://kirerazunesamip.22web.org/keguparo.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/j2TgjYz/30809477205.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/do_verizon_phones_work_with_straight_talk.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/blast_furnace_details.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/c1eb7f7f-37dc-4258-b8e9-c103e733d864/sears_craftsman_garage_door_opener_remote_stopped_working.pdfIn PDF document text
    • http://gijodege.epizy.com/16520150400.pdfIn PDF document text
    • http://wazisosixi.epizy.com/how_long_do_forklift_certifications_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf39a623-07d9-4090-ad56-3ae610848e8c/annabel_lee_tavern_baltimore_md.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/863a520b-f152-4178-a245-acb9897285fb/fafagenid.pdfIn PDF document text
    • https://66547991-fb4b-492c-b271-2b6457db34f0.filesusr.com/ugd/a98e70_109d611216814fdeb3b6b93fe05132d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a016e1-5364-47c8-92a4-e361552ec4dc/gaverirosefitiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86f9045-f7de-4d6a-b686-942b72b3bf91/43943821888.pdfIn PDF document text
    • http://mejavifoxeb.rf.gd/sefuvidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2a6a72-ab5f-42d8-9b9b-08d1d0c5becd/xofebakor.pdfIn PDF document text
    • http://meduzifovum.epizy.com/kozonategabod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327245af-315c-4cf4-a57a-169a478173f8/kataxekekotepe.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_ae6263c59b4e41eb85cad19379fce808.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_0930e124359d40239ea5cad63e1a5d83.pdf?index=trueIn 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_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 4864 bytes
SHA-256: 3de26a0b381d42dea2dad0fea9199511fcd9d5b5ff0b0698f0b6186b1e017c18
font_01_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 10460 bytes
SHA-256: 609d4e2c7b0cc3206f6cad9569ac81726518cb2e9d4533737a8bc0802e48f0cc