Malicious PDF — malware analysis report

Static analysis result for SHA-256 a735396d4d461b96…

MALICIOUS

PDF

79.0 KB Created: 2021-03-10 20:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3b9f528aeac9f43b8961ad88ab9ffdc9 SHA-1: 6cffe32c5e5fdf55e55debf9ffae8ffef8175a0d SHA-256: a735396d4d461b96a55e80b635db7834b9d5fa94260469a78f2b4f831c29401a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for SEO spam and phishing. One of the extracted URLs, 'https://maypoin.ru/award?keyword=arguments+for+and+against+euthanasia+pdf', is identified as a phishing URL. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is part of a link farm, and ClamAV detection confirms its malicious nature. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=arguments+for+and+against+euthanasia+pdf PDF link annotation
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/lexixekas.pdfIn PDF document text
    • https://manajizi.weebly.com/uploads/1/3/4/9/134902852/846ac52.pdfIn PDF document text
    • http://sezafisiru.22web.org/best_dragonknight_tank_build_eso_2020.pdfIn PDF document text
    • http://niwuloxob.22web.org/joxuwuredojafeguxe.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/8b06fed2-b6f4-4195-b43a-1b0d0f54ae74/why_does_my_oven_light_go_on_and_off.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_a6b39666ea2b42bdbbd8411e0cc9393b.pdf?index=trueIn PDF document text
    • http://budakofis.epizy.com/accident_and_emergency_radiology_download.pdfIn PDF document text
    • http://tagitefidunun.epizy.com/bipegumesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc439ee4-02eb-4cfa-983b-e3022d3c3a61/i_love_you_like_crazy_girl_country_song.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_7a361f0fdf1245fbbd888ce6f15b1e82.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_d8a88c0a01a54871bca9b26712f1af83.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_ea6528f82e824c2d94e0897a32c1c489.pdf?index=trueIn PDF document text
    • http://jokipuzovorije.epizy.com/arkansas_mandated_reporter_training.pdfIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_5ffe40cb49e047e0866c8b68e7851b1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b22d075-3629-4590-b36b-f47c8952f506/casio_prw-3000-1acr_protrek.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_f91915e9bb244fbaa0abcb09944fbdff.pdf?index=trueIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_e5b7ce3d379243688df648822e47cffd.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_ffd05eb22ad24fee8d28465200472459.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c0edba-147d-4355-9936-615138d21c56/20046244613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48972fed-71de-43f5-9f56-00c730190342/vegovo.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_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 5412 bytes
SHA-256: 794b84fc6110702eb9b7d31df721808a7c9c6a4ba4b9d76497dd0eda4f623cd4
font_01_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10436 bytes
SHA-256: 02ca0be1ba7f7d037407e4e97f8cc26796c14463d694b6479ce33681786b163d