Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b2519ac11bcbeb…

MALICIOUS

PDF

67.1 KB Created: 2021-05-29 10:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3b7c185975704524cad4c47c4ff4f932 SHA-1: a40ce59febe6e9b370ffd556eb2c35e43e660742 SHA-256: 94b2519ac11bcbeb2ed8da4efe6bae91e24aba0298d36e0ea00c1f6de0c8beb0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of embedded external links, including one to 'jumiwimov.ru', suggesting an attempt to redirect users to potentially harmful websites. The presence of numerous PDF links also indicates a link farm strategy, common in SEO poisoning or phishing campaigns.

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://jumiwimov.ru/123?utm_term=hello+brother+song++audio PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468843/normal_604e8d3666f5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461767/normal_5fee62b2cd9d4.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/puvimetofipipa.pdfIn PDF document text
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/dewetova_tamazupi_gabeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_605113e33b86e.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/segawaziv_palajurepuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415740/normal_606bc4244ef80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_601138d18c4a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6041ba24cb285.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fef8a2d7f3a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473971/normal_604ce87f4c05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_6033c826a9bff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fee95c30a9b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386336/normal_5fe152b8b3208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418167/normal_5fda4a8baeb8c.pdfIn PDF document text
    • https://rojofasefimo.weebly.com/uploads/1/3/1/6/131636828/koxeregegeduv_tavinibupapen_jubasotebinad.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/wegejidopot_dizut_kewibadatarazum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE0 5188 bytes
SHA-256: b2cadd80c8dc82c2d881a04ee0acd235f4e84947208094a74ef0d01c7bab3d90
font_01_sfnt_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 10300 bytes
SHA-256: f605e70321072ea6a57f3604c1be92062170df498c5ee1b856ef21a2d3ee5799

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