Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d625f6a5e91850…

MALICIOUS

PDF

77.1 KB Created: 2021-02-21 11:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c87206c0cb376b257e6bd77983d6f6dd SHA-1: dfe57efd35c0a66c8ee21295c2af96b7e36089cd SHA-256: 68d625f6a5e91850d55913879f5f5addd9fab5f2c9b682dc38e473858d92fd5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous external links, many pointing to disposable domains and forming a link farm, indicating a likely attempt to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a 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=juegos+de+friv+hombre+ara%25C3%25B1a PDF link annotation
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/a979a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_6013945d5f607.pdfIn PDF document text
    • http://antonioit.space/bapajelaruwozigunilowimejtu6l.pdfIn PDF document text
    • https://tokatukunopiso.weebly.com/uploads/1/3/4/3/134352811/kozabagepegen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5ff881a49ec4d.pdfIn PDF document text
    • https://gedijidejejew.weebly.com/uploads/1/3/0/7/130775336/b79a16cf.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/444423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_601f67d9382e4.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/555d19753889c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5ffcdd64c6c6f.pdfIn PDF document text
    • http://infokurs.design/gelumazufitavoteleqsdrl.pdfIn PDF document text
    • http://merovew.xyz/90738799749di5wb.pdfIn PDF document text
    • https://menavexijipiges.weebly.com/uploads/1/3/4/5/134599349/920399.pdfIn PDF document text
    • http://lukegerit.22web.org/69727843558.pdfIn PDF document text
    • http://mastera-saydinga.ru/zegifasataoipci.pdfIn PDF document text
    • http://barbanapoli.moscow/23324399577w1pt3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josejutolaxof.rf.gd/27734377706.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/background_editing_music_free.pdfIn PDF document text
    • http://tavejetenugaku.epizy.com/def_rap_sheet.pdfIn PDF document text
    • http://rubirabe.rf.gd/56325566638.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_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 5688 bytes
SHA-256: ce2cd778061609d7e1cf3d07dde01bf54adfef486d7efb67f8acc45ebbbc13da
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 2140 bytes
SHA-256: 289854c0292170102eeea8cd8d9fa039b7e5adf06f71653ea533c14c4e2d2c34
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 11412 bytes
SHA-256: ae8689fe1b5d368db9758e0f7237c700fe987a86682f710929ca279259ed04b7

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