Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f9faa446c7eea1…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 04:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6c73482e055cc096799d603093200f18 SHA-1: a3e65c0f8e15f511ed0171a36fcf211417a439f5 SHA-256: 88f9faa446c7eea196bdaa81384403ea14e8b024dfa27df900c70e1bfd1c42c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/wix?keyword=soul+of+artorias+wikidot PDF link annotation
    • http://hotgirls.host/tapipajuxagifow6cjl9.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/davawetenepumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5fd3689e97bf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_602a754fd02f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_605795664f43e.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/62256865054upw1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5fee1b083707b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416493/normal_5ff4266fe33b9.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/sujet_de_brevet_2020_maths_avec_corrig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5fc5f510b0f65.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/sistema_endocrino_anatomia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_603a47a0f24d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_603ea9bb99fee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fcdb6fb1c57c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388271/normal_5fcba7c7002e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_60443ccac98e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fca82be38d73.pdfIn PDF document text
    • http://fb-pageunderreview.com/estimating_sums_and_differences_of_decimals_worksheetsj1yre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_602df70065049.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391308/normal_6008d2eba1fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5ff4e03d5e62b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368493/normal_5fc7154e0b226.pdfIn PDF document text
    • http://uptodate.site/zewabuvubax5du1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fe7685a482af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widifusi.myartsonline.com/data_warehouse_tools.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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5160 bytes
SHA-256: 9f3f65238358126a4264e4028108af5325dee210e7c276874f1a48b699a7dc37
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 10528 bytes
SHA-256: 651b8f2be021ebba92d3ac536f623ac12ecb81025e8021fd1db942b21e181b85

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