Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ed47bc7b3526cf…

MALICIOUS

PDF

78.8 KB Created: 2021-02-15 03:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: da7cb61c4396417e04bd54c72cb0893b SHA-1: d2be438fd964c3214e49f9af97af9b955dd6d7e3 SHA-256: 41ed47bc7b3526cf7607dd258c013f3af77d0c8cbaf4928ad0bf658a54d32f60
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/123?utm_term=two+fat+cats+bar+harbor PDF link annotation
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/2865284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5fd6198c405c9.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/ihicHJO/33835601638.pdfIn PDF document text
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/8c76648e8c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_600a208cb024f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417999/normal_60011e741a8a5.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/5c61c22312af8.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/eghc31s/what_movie_to_watch_netflix_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_60141a44522d5.pdfIn PDF document text
    • https://gatikewud.weebly.com/uploads/1/3/4/3/134382011/wetawuvuge-geradegoziniv.pdfIn PDF document text
    • http://silkhfig.bid/20445298xi13m.pdfIn PDF document text
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/3136f734c06c.pdfIn PDF document text
    • http://lienforkid.com/home_design_3d_app_for_android_free_download7813p.pdfIn PDF document text
    • http://hangookoil.ru/freshii_catering_menu9ixf0.pdfIn PDF document text
    • http://speak4pro.com/33284634704qoqxp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_601de4a9c6d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fe78f0fce75e.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_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 4632 bytes
SHA-256: b23518976c5f452b0607cf2e73af63fc298c3fe06ea9f42348fc57d02dc97caf
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 11268 bytes
SHA-256: f59a5efd7a84ca4d3359da550164a68b08b7ef29889ef00eabb571fafde42cba
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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