Malicious PDF — malware analysis report

Static analysis result for SHA-256 f541ec9a6d8069b8…

MALICIOUS

PDF

76.8 KB Created: 2021-03-13 17:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f5551d10e374da71c2b48dab6e1b3ef3 SHA-1: 17fe26c2c0dffa047382ea083179ba81814ad08b SHA-256: f541ec9a6d8069b8173b3244d0a1d105c285585c7fe8810a45fd12e0da0b8de0
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, exhibiting characteristics of a link farm with numerous embedded URLs. The document body, though heavily obfuscated, appears to be a lure related to appliance error codes, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs, including one pointing to a potentially malicious domain, reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=maytag+washer+epic+z+error+codes+f20 PDF link annotation
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/abd1855f9108.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/910529.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/6978317.pdfIn PDF document text
    • http://euroshopmn.space/algebra_lineal_gratis6mtz2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fd1eef859c59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6015a1b5d0126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_604af1121c2d1.pdfIn PDF document text
    • http://1offpark.xyz/fekakofigetr2cp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_60310976a8639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lilivuxaja.rf.gd/jonirujikevavifunagez.pdfIn PDF document text
    • http://lapefub.epizy.com/risagarakogeput.pdfIn PDF document text
    • http://mupufuten.epizy.com/barium_sulfate_msds.pdfIn PDF document text
    • http://judafigot.rf.gd/51117238310.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/itar_technical_assistance_agreement_template.pdfIn PDF document text
    • http://lunupesefobe.rf.gd/16142914279.pdfIn PDF document text
    • http://derekage.epizy.com/game_center_ios_apk_android.pdfIn PDF document text
    • http://nogobixa.epizy.com/suxataxekikelager.pdfIn PDF document text
    • http://zisuvedo.rf.gd/wiwetaniromorejolegim.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/pagedamuniwanunaxul.pdfIn PDF document text
    • http://ladorum.epizy.com/wabosuruzetutifidegur.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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 5908 bytes
SHA-256: 386fd5a62725a01a3f9d3a57ab2d7b2960fdefe68ab78a94ccd5075ad93eeadd
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 10676 bytes
SHA-256: 201b4c40b3c72b874f00850abceb0f35cd1e649344dedefc05aded5b374f6ad4

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