Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba6163b793980a1…

MALICIOUS

PDF

68.0 KB Created: 2021-02-26 22:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1021e0efea45f1a89e6d8f2562f2bca1 SHA-1: 41b43a31a1120e50981937604de3ecc0cc18887b SHA-256: 4ba6163b793980a1ebccd6bff111dede8708fe652107fc16c279743ee32a021b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam operation. The embedded URLs likely lead to phishing sites or further malware distribution points.

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://lozipotod.ru/wb?keyword=avital%204103%20reprogram PDF link annotation
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/nefigema-topokelovuvupud-fanap-nogikodufewikub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_600a5bf770238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_600e83b279672.pdfIn PDF document text
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/7864656.pdfIn PDF document text
    • https://kimilirakafame.weebly.com/uploads/1/3/4/6/134659192/ecbb02.pdfIn PDF document text
    • https://gapurosudezejug.weebly.com/uploads/1/3/5/9/135965954/wusuwomuja.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/information_technology_director_jobs_near_me.pdfIn PDF document text
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/mesabovodos-fovidebumufuxu-zuxuz-leruboju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_60145b9250ddd.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/dosaduvagarutiteji.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/2542088.pdfIn PDF document text
    • https://samirimirusa.weebly.com/uploads/1/3/0/8/130814124/dirubajokasarenirav.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/limilonakotigowalarune.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_off0000bfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDC 5140 bytes
SHA-256: b8c8832dd3c90f781ab9b3f9e0c44b4d1d2ffb276d973b0a2af680a297785f6f
font_01_sfnt_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 10548 bytes
SHA-256: 093c5aa78d8445dd807404d4165702a2a5c2e9ff2351f5997dc7c6197a65e050
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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