Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac46f436b940f48…

MALICIOUS

PDF

70.3 KB Created: 2021-06-13 13:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef2db012b9e13e04248aa72f7c0bc4ca SHA-1: 1123d03cf261537b7af7a905789d61e6e31f1bef SHA-256: aac46f436b940f48ab5d909c5eb41d694d92a386f20ba9d75a9179e40fc89fb9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/123?utm_term=chithi+na+koi+sandesh+song+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488592/normal_60351100de135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_6029c73ab4a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_605d6b15e07dd.pdfIn PDF document text
    • https://sinixamaruxibul.weebly.com/uploads/1/3/4/6/134653816/f926fb70.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/485608.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/dupazegugozo.pdfIn PDF document text
    • https://lovetawufekevo.weebly.com/uploads/1/3/4/3/134339121/baviduvemate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fc8157724794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwedano.pbworks.com/f/how_to_value_charizard_pokemon_card.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/nidizawukofeloduviluk.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144767292/bolijugurixakimekokoro.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/f/3616530387.pdfIn PDF document text
    • http://kosumepifise.pbworks.com/w/file/fetch/145125033/81103415545.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144604461/gusasotomopav.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144492498/online_video_format_converter_mp4_to_wmv.pdfIn PDF document text
    • http://pakesobiroge.pbworks.com/f/nuremberg_laws_worksheet_free.pdfIn PDF document text
    • http://xuxorunewive.pbworks.com/f/94858007254.pdfIn PDF document text
    • http://murenet.pbworks.com/f/friends_quiz_questions_with_answers.pdfIn PDF document text
    • http://sufasujozu.pbworks.com/f/jolees_easy_image_instruction_sheets.pdfIn PDF document text
    • http://lodedeti.pbworks.com/w/file/fetch/144939180/fast_and_furious_9_online_full_movie.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_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 5104 bytes
SHA-256: 7f7fe7dad93a1799666b7a786ca084f24c4a4b27456ec789f78446b983d41103
font_01_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 10432 bytes
SHA-256: f40dbe0a45c0f2b341a87e0a5388f6ff146e3e7f9691612888f5a4babaad88c9

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