Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f77def4ddb8362a…

MALICIOUS

PDF

85.5 KB Created: 2021-03-09 14:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5282d8dff245fc0687afd5932b85db72 SHA-1: 98b6da5a205c0199fb381e8d8cfd7f4f4c464348 SHA-256: 7f77def4ddb8362a0f0838fe8ba2f9aae149568c6b26372d60c1f0fc21de5d69
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. 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 sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=how+many+miracles+did+god+do+in+the+bible PDF link annotation
    • https://cdn.sqhk.co/rapekerokemo/jjhW3gi/granny_chapter_two_escape_game_online.pdfIn PDF document text
    • http://zizaburixakog.iblogger.org/attention_love_ep_10_eng_sub.pdfIn PDF document text
    • http://zikifogomi.22web.org/bapatuvesor.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/dX1Dgfe/solano_supersolano_3500_lite_hair_dryer.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/eBhcFhg/65174161407.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/ifniihf/m4_paintball_gun_tippmann.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/iigfEhj/minecraft_tutorial_world_download_pc.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/d3d2054c-9cbd-4052-a9d9-b7dfa9aac866/charter_spectrum_remote_control_setup.pdfIn PDF document text
    • http://fizodebejena.rf.gd/la_la_land_movie_star_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9635e4-7202-4acd-be09-17849f975923/bedese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442dc6f4-b683-49d9-b00b-4a7b179f4272/bobonenavagevugemi.pdfIn PDF document text
    • http://vefelazubogimew.rf.gd/trust_deed_property_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3c40e6-0e22-4dc9-9dd3-04d96221e3d9/34581281421.pdfIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_2e56e9bbf15f4370a0b8aaaeabe10c39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d746a872-dafc-4f6c-a21f-b4fc39c9eab0/30683857198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9123e3-08b3-46b5-ae59-9e765c9956ca/maytag_washer_dryer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563e964e-3c68-4178-91fa-9df43758284b/warusuzazasezizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59aaad2c-1469-4846-8ba7-eca6d6cd9f8f/lakota_woman_mary_crow_dog_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a432d0-0d0c-41c4-9335-a5cf0fa9c1b2/43899572562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae0ec9cb-8f36-430b-8742-f0f6af65568b/special_right_triangle_worksheet_answer_key.pdfIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_d4736598d1a54ed28b0738056b050671.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e45ae30-e080-4771-8121-ace06f43106f/gaxetibupagajatitebiw.pdfIn PDF document text
    • http://verirajoxa.epizy.com/waxiwuzekiki.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_892511b1b9204874892cff67bd9d6ea8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc593e56-1e1d-45f6-a1e1-b3201171248f/jiwitedamudugadefevi.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_off0001100b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100B 5648 bytes
SHA-256: 25b94ad71c59dc4342f6fedf2f1246bcfd631ee77d7b95bf0d0a12def7cfba43
font_01_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 11028 bytes
SHA-256: fc2f54d8696d2c7a336bf97c34079cd481b2704e8ece8a9b1c17693b2287d420