Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc26aa7a9956de8b…

MALICIOUS

PDF

76.7 KB Created: 2021-05-13 04:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bd78b057d7f23858c5c2f6aa6eaa9289 SHA-1: 2b156c2a9d460573f5773e3dd89c07b393e89e07 SHA-256: fc26aa7a9956de8b3c7db1f3aecfdb32a13a3ee402b53b9fa6f6355d42f19abe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=do+bosch+jigsaw+blades+fit+black+and+decker PDF link annotation
    • https://cdn.sqhk.co/zimogemage/oY1hwtf/tikilejavakek.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/c70jbgf/idle_aquapark_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/danopefasuf/krDmheJ/scad_assistant_director_of_admissions_salary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_6005216812a3e.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/iidhjii/juego_galaxian_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_601ecb120e066.pdfIn PDF document text
    • http://igcopyrightverify.com/best_image_to_text_app_androidgxnch.pdfIn PDF document text
    • http://alcexpress1.xyz/16603347134eplk2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5ff5be788d76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_603332a67cd29.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/ih0gi6A/41960168785.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/ekhdjgo/4796776033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_5fd26b5e9e06f.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/pirofopafu/free_app_english_to_urdu_dictionary.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_0a3b5cafc01b47aeb23ae9203d831525.pdf?index=trueIn PDF document text
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_838c434eadef44dd90bb9ca318512d53.pdf?index=trueIn PDF document text
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_f36011a8928647d98943cb0fdd847ecd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fogibi/coliformes_fcaux_risques_pour_consommateur.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_65275530339340948fe9d2ea3aaeb505.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_3527504c787143b6a97afa39471fdbdd.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_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5652 bytes
SHA-256: 1cb6290d861860ed21c679ad89c0e361cc4252144f551a6a8b885adc3fb59049
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 11492 bytes
SHA-256: 94ca6845346a8077864bdf0c81cb65fce00e998fd47fd3d15693f2e3cfdc397a