Malicious PDF — malware analysis report

Static analysis result for SHA-256 6108d5b5c692f8c1…

MALICIOUS

PDF

76.5 KB Created: 2021-04-09 08:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c7648ac345a7a1cc754c7c0850863ea7 SHA-1: 7bdce1dee62e597f47cba646052ff4aee4aabb6b SHA-256: 6108d5b5c692f8c1a62b914494c23e12e7805ad74be7d6df7a260feff9818df7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one specific URL that is flagged as malicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/strik?utm_term=poemas+en+lengua+indigena+y+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/lisakopew/ziiWhek/adventuresmith_explorations_alaska_reviews.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/remafiwugatoki_luvekanexule_maniva_limagatixuxolu.pdfIn PDF document text
    • https://cdn.sqhk.co/samojusive/hdugcBF/zombie_craft_survival_3d_free_shooting_game.pdfIn PDF document text
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/f1d67dde.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/3917396.pdfIn PDF document text
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/8284715.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/dZAJOTT/pac_man_vs_snake.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/3860640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_bfdc996f8bd64de19b932047dfc0f9f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbeeac61-46ce-48ac-8f3e-7944753d3898/halo_games_in_chronological_order_2017.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_016f275fe89244949111de09ba82987a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/ruzokejijosotizironajator.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/vopunoxudosot.pdfIn PDF document text
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_8214e26e0dc349acb278b20a7fd9f41e.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_2f72df6a87da4b468a97cb7929475a78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3312de56-82e9-43d0-b2ed-8fcc1a920deb/does_my_baby_have_scoliosis.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_28061aa9215645b2935c8e9cba6f7b12.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49ef664-cf51-4364-abc6-7fbbf9dab0f0/24641512029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155d0f14-3ddf-4009-9a75-ae6e813ac095/36641428910.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_49411c29cd9c4f3e959eb41faf6602b7.pdf?index=trueIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_ade81fca6ee54178a2c490f3c492ec50.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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 5496 bytes
SHA-256: 0f6702bc725c829e9a656f3b4de79961073fee75953ab5dabd5c5dcbcf053642
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 12068 bytes
SHA-256: ad7aee6ffe3ee64a1a5a3dc75f86db6890692b76cfa271da8855a80bad6d36e1