Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b26cb0d83bd4802…

MALICIOUS

PDF

76.3 KB Created: 2021-05-09 19:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f57b0fdab3ebfa36d16a002b2b37b4b2 SHA-1: dd1a4c995ca1d6a89d19d501ed76c82e87272e4f SHA-256: 8b26cb0d83bd48022d64fc33c96ce99c557a4087d44299b1cdc758b570df0da3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, characteristic of link farms used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were extracted, the primary attack vector appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=is+power+book+2+a+prequel+or+sequel PDF link annotation
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/1051792.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/ihceohj/72447335571.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/9V3Shin/18182192131.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/geia9jd/l4d2_survival_map_console_command.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/vivomalufakoporamutokufe.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/encyclopedia_dictionary_free_download.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/rokoreg-rijanud.pdfIn PDF document text
    • https://cdn.sqhk.co/wogigixa/hjagfge/nevodefa.pdfIn PDF document text
    • https://cdn.sqhk.co/sitosuduf/ToZjalg/kujilarifiberi.pdfIn PDF document text
    • https://cdn.sqhk.co/foligezuli/6icjagc/anabolic_steroids_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/bOgfiiq/52529662555.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/13bf2273-ec08-4075-9cf0-a48f1c259425/48103438282.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/zopovezoralawanurogilolax.pdfIn PDF document text
    • http://fopekexu.epizy.com/the_great_hunt_audiobook_free_archive.pdfIn PDF document text
    • http://kimirukuku.epizy.com/is_fifty_shades_of_grey_on_hulu_or_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11339c51-6561-4da2-94a2-0716d331284e/mowisomunedobekip.pdfIn PDF document text
    • http://rajamuviw.epizy.com/poe_spectre_fossil_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894a9bbe-fbe1-40fc-8bac-fb5b8aac7e9f/46103115626.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_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 5304 bytes
SHA-256: 46e5b83049a49b5686de5ffa9c77e9aba3024c8d067d9dc73d789b265ab2e030
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10852 bytes
SHA-256: b2534c19e69ad3c6ca783d82f4fabc46430d3a65d4de47199862949c523daf4d

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