Malicious PDF — malware analysis report

Static analysis result for SHA-256 2259f8c83c28c330…

MALICIOUS

PDF

114.5 KB Created: 2021-02-15 08:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 674c47263248b1c5dd1207caf261ae27 SHA-1: 136129b023d97b074b9f9a824d7b973c03218957 SHA-256: 2259f8c83c28c330a35841f4e75aa5102e345ad3b78c33fb98d545269ddf9157
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure itself likely facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/aws?utm_term=acute+liver+failure+guidelines+2017+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448731/normal_5ff2950d4058c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_6013f7d38065e.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/3731129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_60212928b9306.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/hbVajjW/moving_tower_in_dubai.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/javaduruwusikipuwen.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/dnaIhgH/play_store_lite_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/jhghidk/kodi_build_for_xbox_360.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fe51a96c701f.pdfIn PDF document text
    • http://moshon.space/mivutapabidomoe5ujx.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvokitebixe/bmHtqhd/botugaleguwopijerese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_5fe69a1eea55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_60135b0cdb1d9.pdfIn PDF document text
    • http://ezfix.asia/ilford_fp4_plus_sheet_filmqbffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_5fd966f44c109.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/d4125.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/gumasinuvisomaf.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
    • https://s3.amazonaws.com/sagotomagin/act_220_ghana.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/54736460986.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/individual_income_tax_return_guide_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/loligelifivokepusi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176EE 5552 bytes
SHA-256: c614bc448a85ed874058917400cc163de93c8917c731e2632692c2b61737e49a
font_01_sfnt_off000189ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189EA 10588 bytes
SHA-256: cd28bb8c6431e066efee28341a1c998be016101aa770ba1203556eec34922d0e
font_02_sfnt_off0001ade6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADE6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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