Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6db05bd60543322…

MALICIOUS

PDF

75.9 KB Created: 2020-11-23 21:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 12c561bb207d443f485f375e32f7b7da SHA-1: d32dd333d8bbc9fd65fc691416d77da38e93dd50 SHA-256: e6db05bd6054332257eda809423d67e9ec36b9b956dfeab791d4b81d2aa41277
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://trafficel.ru/strik?utm_term=rodrigo+fresan+pdf', is flagged as suspicious. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. No scripts were extracted, but the structure suggests a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=rodrigo+fresan+pdf PDF link annotation
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/limem-mulirekop-gomab-lafibid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_5fa047e6e67de.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/kavalukato/93645058133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fff3f24-6cd7-4968-8d1c-f4f30164801e/37149657808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf1155a5-0f32-43f3-9848-800bd6cbc514/wakotudaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c8a77d-1404-4c87-9a83-b1d5681eb268/43730362714.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/xidolanapadalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70c881f-97c6-4bda-a7b3-8b0b27797996/dozewulakuwogifezivuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec889c2f-5b06-4a62-beb5-2b192d5f8439/survival_analysis_techniques_for_censored_and_truncated_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc22ef60-a91d-4bd9-b374-3cb0f8536be2/fexigejukosobudebematiw.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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 5184 bytes
SHA-256: 985802f0038703cf6eb761674d7e643de592940255cea291c9ac25525a92890b
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 11884 bytes
SHA-256: 7f75081cb92e60783f0746d56481d50e5628c6784c3a37f11368bc5706cb5577

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