Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf47841485131c7…

MALICIOUS

PDF

65.9 KB Created: 2021-02-27 15:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c921925e6ebf00c709d6c45531de5560 SHA-1: d94fdad81aacbac716facec20ec888d6c6a4f839 SHA-256: cdf47841485131c7b3759b5aa49c29230689ac832136e8a2f507943e5af31c9b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a user guide, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=bissell+rewind+cleanview+pet+user+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387709/normal_601950f69fb52.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/30668743068.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/aJififJ/91085218690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fec7b7635f05.pdfIn PDF document text
    • http://getne.xyz/bearded_dragon_facts_sheetcjzkj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384026/normal_5ff9628ae9152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408704/normal_6023f3b3d3bc8.pdfIn PDF document text
    • http://counterman.ru/og_mandino_university_of_successk98v6.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/how_to_reset_honda_radio_code_error_e.pdfIn PDF document text
    • http://vazutokidoxe.iblogger.org/how_to_search_google_history_by_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389586/normal_600776c390031.pdfIn PDF document text
    • http://allerlo.xyz/foloxafemuzefepuxiuumk.pdfIn PDF document text
    • https://cdn.sqhk.co/gabunufu/dmRkg9g/inside_out_drama_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/i9Ljjgi/74163290901.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/posufij/degrees_to_radians_conversion_practice_worksheet.pdfIn PDF document text
    • http://dakokaxawizepu.epizy.com/android_google_maps_api_key_programmatically.pdfIn PDF document text
    • http://janutozekim.epizy.com/71614989840.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/smart_watch_bands_ebay.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/togudiwuwotulis.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_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 5444 bytes
SHA-256: 59de973df194e552be319a723eb99c41a6c3208967b91ff3365db8b799de5f0c
font_01_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 10084 bytes
SHA-256: 0cf6e766d5f817c3b8044c830f819fa7a5b74c3fed9ce6a0737266c5b57b5fe4

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