Malicious PDF — malware analysis report

Static analysis result for SHA-256 51928cf7da30f365…

MALICIOUS

PDF

67.7 KB Created: 2021-01-06 12:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1ffdf88d8af2182a215d7dd76d808679 SHA-1: 808bd798dccaf851dd786fc49b3c363c5bff5508 SHA-256: 51928cf7da30f365206f12528220859d79b57a8c3acecb3c2018f9f4ec494379
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://traffine.ru/123?utm_term=t+shirt+shontelle+ft+the+dream+lyrics', are likely used to redirect users to phishing or malware distribution 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=t+shirt+shontelle+ft+the+dream+lyrics In PDF document text
    • https://xikubafol.weebly.com/uploads/1/3/4/6/134607040/giminokodek.pdfIn PDF document text
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/noluw.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/aff93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_5fbcf898a9b69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408588/normal_5fcda1c822ab6.pdfIn PDF document text
    • https://rovijekamiveva.weebly.com/uploads/1/3/1/4/131437241/8343390.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/libeganot/18_mbps_to_mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2cb1e6-22ff-4c08-81a4-f0f2a981724d/xokebofu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/deketakisufalixasimine.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/bodakigamiwole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38856a12-7c4c-4104-9478-0ac17f79ba5b/16107282527.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/gate_2018_instrumentation_books_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291ddaaf-948f-4244-8934-d1097a80a7cd/wavimanipakaperusabug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642495a8-49e5-43d0-8f22-35fbfbb2a075/49537808109.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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 5312 bytes
SHA-256: 287ca1ace7cd877a735582e5f24ad9356e62d0b7e3200a805944a60ede1c534a
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 9880 bytes
SHA-256: 353850cc5f95d36578cd53c2fd097c74aed3ec34f249b55bd6b5cbe49ee8ab2e

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