Malicious PDF — malware analysis report

Static analysis result for SHA-256 c61d0a16b8ed8065…

MALICIOUS

PDF

65.5 KB Created: 2020-11-10 07:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8f5eb8e725aefefb0424b39d287ccfa4 SHA-1: 1917d643a14b694bd6bc39691a7b654984f938c5 SHA-256: c61d0a16b8ed80656d3a15a6a26925d8c9176226366d37fd56601cbd9e9bc420
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm containing numerous external URIs, with specific mention of 'https://trafffi.ru/strik?keyword=ust1102+pool+motor' and 'https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/3159148.pdf' as key external links. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?keyword=ust1102+pool+motor PDF link annotation
    • https://roxexiku.weebly.com/uploads/1/3/4/4/134445291/3159148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_5fa25b2a25eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f9d35c3880e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5f98d9eb9f827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5f8ea7884d5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fa5bcbeb4099.pdfIn PDF document text
    • https://zedafirulatako.weebly.com/uploads/1/3/4/5/134584693/6817672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f99b5b100bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5f913161347d2.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/3aa07a0e-c9ff-4151-abad-307ad5c92227/jizoxozed.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/budget_2018_upsc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c285c2a6-b942-406d-9861-f5d4a324e6bf/misejuvisotoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acae457b-6c58-4b74-b4ee-c68ef3e6ec6e/83015018676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1548a8f0-b48b-450c-b547-38930209dbf8/tamilnadu_voters_list_with_photo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be55ff08-ad5d-4d7c-b6f2-fd30f5540073/inverse_variation_worksheet_with_answers_8-1.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/larson_geometry_extra_practice_answers.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_off0000c61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 5072 bytes
SHA-256: feb6ffb11414c92aa6debff4075a49098feff4a1d8c46e79fd264b0f8d3cdb90
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 9996 bytes
SHA-256: cefa70c61a148da93214529ac71ce110013be9a090bcc245e8cc06dc8b86ae99

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