Malicious PDF — malware analysis report

Static analysis result for SHA-256 5688d31636a3c502…

MALICIOUS

PDF

75.1 KB Created: 2021-02-21 03:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b4c84578339a4f42ba3a878d0d078d24 SHA-1: c92fbcf27c81e15968e82966bf842a8d96fc3f4c SHA-256: 5688d31636a3c502e77d167e628b24cf062d022587d5a8bc0aa5d38df66fca85
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents.

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://druttle.ru/123?utm_term=16+pulgadas+a+cm+cuanto+es PDF link annotation
    • http://itayoga.space/holyrood_park_guided_walksh1khw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_601fcc649c05e.pdfIn PDF document text
    • http://swiss-gear-top.xyz/46126234199gfuww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_6019936ab2523.pdfIn PDF document text
    • http://health-top.ru/sheetz_mac_and_cheese_bites_nutritiona5hyj.pdfIn PDF document text
    • http://1freedom.space/tidaxefewuwoduvopegusexi7ovwb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_60047a358ee94.pdfIn PDF document text
    • http://kyhni.site/27175680898xfbcl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503309/normal_60150e4ed6835.pdfIn PDF document text
    • http://bamimutekinawaz.22web.org/appelstroop_font_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5fec4b80d6c0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fdf0298bb9b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedaremix.epizy.com/butterball_electric_turkey_fryer_instructions.pdfIn PDF document text
    • http://lesexugisitu.rf.gd/fopajamobu.pdfIn PDF document text
    • http://puxedasepuk.epizy.com/fevujinuparag.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/gmail_inbox_all_attachments.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 5408 bytes
SHA-256: ae6fc42df3b3ac6264b5b4e3bdfbbc8be0db3b43a8422b2a196c3895034b1436
font_01_sfnt_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 11616 bytes
SHA-256: 0e6d3fd9dbc178161da7639fe5dc496abb1c192e13eadd8e8e1644d98c830117
font_02_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 16100 bytes
SHA-256: f4f5fb0209a4714c3cbdfe9b8e29dbdabffe5d2cbe58e8cc741460ff97ba63ed

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