Malicious PDF — malware analysis report

Static analysis result for SHA-256 44865fe5b6cb2bb9…

MALICIOUS

PDF

68.4 KB Created: 2021-02-13 15:42:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b45e63f842b5115b9c5738577b106c6 SHA-1: 5995cff9abd360e74d2a14fca37bb8ee814d7dc1 SHA-256: 44865fe5b6cb2bb9650efb388b906f631831af6c6e57971d842a2c47c542fbc7
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and Weebly subdomains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://bologen.ru/wix?keyword=rea+esl+study+guide PDF link annotation
    • https://zajefogana.weebly.com/uploads/1/3/1/4/131407312/kagurezamogados_fifijavolepolu_xulekoxu.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/zufozudizosimi.pdfIn PDF document text
    • http://mekozeka.66ghz.com/jardine_matheson_hldgs_ltd_annual_report.pdfIn PDF document text
    • https://govexofube.weebly.com/uploads/1/3/1/8/131872198/291912.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_600668a9ab825.pdfIn PDF document text
    • http://vafutixon.22web.org/ayumilove_evan_skill_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_5fd22fdadbd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411926/normal_5ff06261667a7.pdfIn PDF document text
    • https://gokisixoxi.weebly.com/uploads/1/3/4/1/134108612/zowonavisizu-sokuzemif-wupurulag-negibipubazo.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/jusagi/30615979204.pdfIn PDF document text
    • http://tutunod.epizy.com/bekizomiburazudope.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/sozilukog.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/72430166870.pdfIn PDF document text
    • http://satuzolo.epizy.com/bioscope_app_for_pc_free.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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 4672 bytes
SHA-256: d54d7583190d3a3e0f5bd69108ac8448d8e63884e40b96ac980fe7dd11b92322
font_01_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 10124 bytes
SHA-256: 79eaf83fc5b6847b17a9e56b286479488eedc6d7fad7034a2092a0da48c16939
font_02_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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