Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c95c2f7314ba7…

MALICIOUS

PDF

68.9 KB Created: 2020-11-13 16:35:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5a02f824c3ccc3c2a3002082a65cd61e SHA-1: 5febfd622391ed9e85caeb681c6b8c4daaf1d6d3 SHA-256: ca1c95c2f7314ba77fc27825fd94a51408b0fb500232cd2daf9d5ec234a36573
156 Risk Score

Malware Insights

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

The PDF document, masquerading as a private sale attestation, contains numerous external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The presence of a critical heuristic for PDF link farming and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites or download further payloads.

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 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.
  • 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://traffnew.ru/strik?utm_term=attestation+vente+entre+particulier PDF link annotation
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/ea3db.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/ca075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_5f93251eeec5d.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/tavotax-jepejikujax-zagasu.pdfIn PDF document text
    • https://nulivoji.weebly.com/uploads/1/3/4/3/134343303/6244095.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/fukorojewugikojulo.pdfIn PDF document text
    • https://mamaganonofob.weebly.com/uploads/1/3/4/6/134602085/roluw.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/c000471e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460723/normal_5fa26fdcc3c95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuses/d_d_5e_character_sheet_form_fillable.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/adobe_color_cc_crackeado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90bff1f4-5701-41f1-90ad-b72c559fe88b/diep.io_hacked_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/dopuxuwalof.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/97868356635.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/hampton_bay_wood_burning_fire_pit_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7419ef95-61bc-42ec-b5a2-ccbe2f867192/netgear_g54_wireless_router_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 4976 bytes
SHA-256: 544fc1ab86afdc63690a7c90bf74399a097ea46ccbe2b1cdcbc27c361bc5aef0
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 11664 bytes
SHA-256: 72746ad13b4a873c985930d3195fe309197f021ba14dab7ff998bf11a76076c2

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