Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db89a2187e8343b…

MALICIOUS

PDF

74.8 KB Created: 2021-05-07 22:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 933703a757726a288b58c40cd3d5d226 SHA-1: 1096c11eacef168bb240330f8e1fb090aa2b5ce0 SHA-256: 1db89a2187e8343b80553d39831d2de59e8d20e9fb257688401915100908187a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=how+to+write+a+thesis+statement+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fffa1311d448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_604aec0cccd7b.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_605d74fd9ee09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_606d15930aba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6027f2ec5c7ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5ff776ff25f16.pdfIn PDF document text
    • http://creditscoreusa.info/euro_truck_simulator_2_dlc_scandinavia_product_key_generatorr8s4a.pdfIn PDF document text
    • http://volupixo.mygamesonline.org/49615383154.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/93641168109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405652/normal_5fef5252298cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_6005e7fea4dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411270/normal_606949f767cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_601608cb70711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501229/normal_5fd250582ab98.pdfIn PDF document text
    • http://goromeo.club/blessed_john_henry_newman_rc_college_uniform72i6z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_605da13614575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcb6a182446b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_4b6ea0af8e8d401fb988f2ec01149f62.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_7754db06009749c48f2657efeb4c743a.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5152 bytes
SHA-256: b2ab641055395c4cdae69967560d2c57fb1cc0aa04568b6a07fb6adc4821661f
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 10540 bytes
SHA-256: 523a46c9e9cb72ce68162934d70c22993d2071f1fb29377381eecfecc4b58e84