Malicious PDF — malware analysis report

Static analysis result for SHA-256 8279754634253e90…

MALICIOUS

PDF

75.8 KB Created: 2021-04-04 21:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aed96d806592d1d5ac2c1c8cbe4cec68 SHA-1: cb4eb44b86e126873543e55afcb7644558a3d93e SHA-256: 8279754634253e90136cc00f5c1bf0040c34135572e09c00e7a050d91b566b3c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=mcgraw+hill+texas+history+answer+key PDF link annotation
    • https://cdn.sqhk.co/numovasovev/bhamVjd/moon_jellyfish_for_sale_uk.pdfIn PDF document text
    • https://jixidaku.weebly.com/uploads/1/3/4/4/134495137/todopuse-nilufamuwutuni.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/zuluwobu.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/0ed76a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/Zo4AifP/free_presets_for_lightroom_polarr_filters.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/17b5ccb2a19c548.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/ljjdOhc/bopejomiwalumum.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/kuwebabapi.pdfIn PDF document text
    • https://cdn.sqhk.co/guletema/gcPQ2ee/plane_flying_in_formation.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/hV16Shi/fire_flames_live_wallpaper_for_android_download.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/xapidajovaji/83136836922.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/seninuwoguxesuso.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/acorn_insurance_formby_vacancies.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/39020715903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d70f48-b299-4bb1-a023-5383de2dc336/63079420485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656d69df-f625-475a-9caa-f23f1d2f559d/sefove.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/62441230805.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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 5392 bytes
SHA-256: 16889934cbc21c29bf45754a156285b21d02fbcf3d54ef176ec7de1e4bf782d7
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10816 bytes
SHA-256: 91edf7068feffa36b853778b431c7ca52c94c66f7efbc60b1809505a707172ac

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