Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c325b2b813e4052…

MALICIOUS

PDF

82.7 KB Created: 2021-03-23 17:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f22f3bc3884fe49cc836b454cf1fc75 SHA-1: e647ef7a38e2384ae0262e3f3db8773b27644834 SHA-256: 0c325b2b813e4052f5da18c2724ad28fd24646adce08f17031acd2860f690a7e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://resalured.ru/award?keyword=introduction+to+logic+irving+m.+copi+pdf+download', suggests a phishing lure related to downloading a specific PDF. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=introduction+to+logic+irving+m.+copi+pdf+download
    • https://cdn-cms.f-static.net/uploads/4409796/normal_60152fc236bca.pdf
    • https://cdn.sqhk.co/vagofedewat/eGggjib/fapikaxukudekexurukezifa.pdf
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdf
    • https://cdn.sqhk.co/duporetixi/Vm0VggG/aashiqui_2_movie_pagalworld.pdf
    • https://cdn-cms.f-static.net/uploads/4403543/normal_603f9c0cd5b2c.pdf
    • https://cdn-cms.f-static.net/uploads/4486748/normal_60378f2fe904f.pdf
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5febc34f26624.pdf
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/medeko.pdf
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/lenulivekunefof.pdf
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fc753f653c72.pdf
    • https://cdn.sqhk.co/xovujiroveg/haRmjhz/rewards_program_definition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1c6e584-fa8c-467a-946a-404281170987/how_to_find_fghx.pdf
    • https://s3.amazonaws.com/gixawetopoli/vcenter_client_6.pdf
    • https://uploads.strikinglycdn.com/files/fc8b8232-7547-4bb9-af98-72e0e28cd1cd/lexaketukomobepomomeb.pdf
    • https://s3.amazonaws.com/damerirazib/buying_process_in_marketing.pdf
    • https://s3.amazonaws.com/muwomapotumugi/dd_5th_edition_unearthed_arcana_ranger.pdf
    • https://s3.amazonaws.com/ruzaganog/korupirisoroman.pdf
    • https://s3.amazonaws.com/belopudevuzuza/physical_chemistry_a_molecular_approach_solutions.pdf
    • https://s3.amazonaws.com/salosibejodod/learn_basic_arabic_language.pdf
    • https://uploads.strikinglycdn.com/files/7923fc33-df29-4e66-9687-3836a5d4e84a/32850663373.pdf
    • https://s3.amazonaws.com/tiduro/65319583927.pdf
    • https://s3.amazonaws.com/mipeboro/93116219641.pdf
    • https://s3.amazonaws.com/fifomi/15736175480.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ec.bin
42945f7fd5d1b0e9d17b53b7eb998506ea7fb4574818987d9393976ec414baa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 5420 bytes
font_01_sfnt_off0001175e.bin
a542febff71774ca0281dceaf384c4980cd141c18bf6e5ec062788fde3ce0f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 11112 bytes

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