Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ec65070b763014…

MALICIOUS

PDF

61.3 KB Created: 2020-11-13 08:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3b424099d8980c5089e87a95e13b5624 SHA-1: be12289a954e6e6f4e54fe4a95ef3a08e79bdfb1 SHA-256: 65ec65070b76301439324b836845f3226833ae736ce390fa2e74384bb1c32e9f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pattern. One of the primary URLs, 'https://traffnew.ru/strik?utm_term=s%25C4%25B1rad%25C4%25B1%25C5%259F%25C4%25B1+analiz+matematik+pdf', is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=s%25C4%25B1rad%25C4%25B1%25C5%259F%25C4%25B1+analiz+matematik+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f88f54e5a301.pdfIn PDF document text
    • https://kotafogora.weebly.com/uploads/1/3/4/3/134322717/dagujakesukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_5fa5668e4a09d.pdfIn PDF document text
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/jafadeke.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/dazemi/34283820583.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/coplanar_waveguide_higher_order_modes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84eb96d8-1aa8-4f23-9ded-63b1d016aef3/48366367014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef31113-dd0e-4879-b5ff-aa97ea7f3245/2010_ap_biology_free_response.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/teacup_chihuahua_for_sale_in_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80b4427-6488-43ce-9d4a-777c02876252/34248872977.pdfIn PDF document text
    • https://s3.amazonaws.com/jufinanamek/lilarolugipas.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/lomifixero.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/82978354979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876c9630-3ffe-4f13-810f-a29bccc32e5c/mobudix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a620b2-60c2-4f2e-ad36-287afb2c909e/initiation_of_claire_castel.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_off0000af2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2F 5504 bytes
SHA-256: bdf502122a2d27ad4994a4cb0e7ee326c1725e573acaa7a2d0824590fca4297d
font_01_sfnt_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 11756 bytes
SHA-256: 03cc96b58c670e538add64e0aecaa865248770686b3ccf3c86956cfdd845f4a9

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