Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c9e2f9bdb5e28a…

MALICIOUS

PDF

71.5 KB Created: 2020-11-26 16:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dafdb8502f97a9c93682e4576a81d78d SHA-1: f461eb4380e98d97c97a52120fafa32f5ffe7e7a SHA-256: e4c9e2f9bdb5e28a0c9324367ff33e5d3a3e2c0365563fa05c61122b69f25185
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate the PDF is designed to link to a large number of external resources, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffking.ru/123?utm_term=sample+letter+of+explanation+for+mistake In PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/nidasiwe_xobakidat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_5fb2bc1e0338a.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/pigububetos-gigob-gabukulifap.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/d8c5b8ff4.pdfIn PDF document text
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/xamovezeret.pdfIn PDF document text
    • https://jelijase.weebly.com/uploads/1/3/4/6/134694082/roduw_pemudezej_vefiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379842/normal_5f9277d4ebaf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xajowu/vozikodigezevuximefata.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/approximation_algorithms_vazirani.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/swords_and_sandals_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/fenojo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/bombay_to_goa_full_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/2020_yamaha_yz250fx_maintenance_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0E 5068 bytes
SHA-256: 6e9deff2404cd623b5de412e0fe2e3bc918a44599d2845055037ba284123ff44
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 10176 bytes
SHA-256: f295ccad418e27e3c072ddc80cba7725217217b786877beb33145ed787c96911
font_02_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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