Malicious PDF — malware analysis report

Static analysis result for SHA-256 5090872e47024981…

MALICIOUS

PDF

67.0 KB Created: 2020-11-25 18:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 84d56f0334a57e659eb77f6e813dfa76 SHA-1: a908647dff9641c1fdd51d20308e5f12432af7d0 SHA-256: 5090872e470249812fac64742388b29ba286bff3846a675dbb836a7b0068266d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed 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 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://trafficel.ru/strik?utm_term=board+formed+concrete+planter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454432/normal_5fa4810e39d0f.pdfIn PDF document text
    • https://wabemogulumog.weebly.com/uploads/1/3/4/3/134384503/kibisozovizejefu.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/9735157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f898d0cabd0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5fa76b2a6748e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fa4a5b25e31a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/849aac61-9078-4c65-a716-81d458f3f0b5/62495329775.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/lakejekididolazut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a600981-c3d1-478d-b6c1-f6955d4af2c7/83710164816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e08abf5-6fa2-4384-b61c-e73cb6f161bb/pipevimofopuwoguxeref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76976a0-b588-4744-8d83-d4cb154eea41/valor_absoluto_y_valor_relativo.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_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 5172 bytes
SHA-256: 513f0ffb0247afff8ae3031cd6a90e5a8dbe5f377a5befa3bdbdfbe9f931e827
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 11072 bytes
SHA-256: 010a11c74d8258054ae87ddcaef4215bee258175643fcf534acaaf5316ac2d70

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