Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b153b16e361afed…

MALICIOUS

PDF

76.7 KB Created: 2020-11-12 17:51:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1d790b7150d6a5825e7f8ff57ba13fbb SHA-1: 2843283503a0fd48b55d72c903e05670efaa07ca SHA-256: 1b153b16e361afed1338dd5debe71f599a9bf42f3f5ea5966fe156be75f25192
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'trafffe.ru', suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection to malicious sites.

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://trafffe.ru/123?utm_term=fort+knox+weather+history PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410002/normal_5f98a845adc84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5f9f7dc28cb3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f90af44bf887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fa6eb6643194.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f9b148ef2cec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f8aa8c4d1489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f8f60f9eaa79.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/72d6abcc2.pdfIn PDF document text
    • https://wawotixivawipi.weebly.com/uploads/1/3/4/4/134474061/df8b73ebc51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_5f9ba3c9f1579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_5f95a227c4e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f8c5867a0a48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8f4b9e6cbbd.pdfIn PDF document text
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/88e4661d3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f92333429579.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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5024 bytes
SHA-256: 7e6146b53a291868899997f057fbf2d8dac46c26674e62c452730d2557725270
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 10516 bytes
SHA-256: d04b2bdf3e9b9281070ddb6424d007de81863e4f73794fa4a27bd935118af8c0

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