Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26ae142f38fe6c7…

MALICIOUS

PDF

84.9 KB Created: 2021-03-01 01:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0848740091d449ebc612acdbc47c4918 SHA-1: 898a024cf8fe63ea32e0a1f5a9ce69f954f0f4dc SHA-256: b26ae142f38fe6c7bb96959c44dde2190ed5860fb15fde9f7aac81a41a0e9cd7
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs point to various domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/wix?keyword=leica+crf+1600+b+manual PDF link annotation
    • http://whitecheat.xyz/kirana_mal_list7epju.pdfIn PDF document text
    • http://udilische.club/71352301350koxcu.pdfIn PDF document text
    • http://segway-wheelchair.ru/sarah_dessen_the_truth_about_forever_age_ratingfhdf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459791/normal_5ff35c627376e.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/can_human_live_more_than_200_years.pdfIn PDF document text
    • http://exemplpusj.com/fallout_shelter_online_iphonefe746.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/dungeons_and_dragons_books_barnes_and_noble.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/204367263611a1c.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/replacement_parts_for_shark_steam_cleaneryhl8l.pdfIn PDF document text
    • http://cocobuka3.xyz/86374788147vu3u9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 4968 bytes
SHA-256: 6565d352cc9edd7b48efebbb4e9e35a8ac3323359305a7159b954ca9ddb64aef
font_01_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 10528 bytes
SHA-256: 0127e871afd62583f4dc188fd9dc70137372178d8c186cd532027d5fc174396e
font_02_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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