Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5fe631ff38e203…

MALICIOUS

PDF

61.6 KB Created: 2020-12-24 11:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 65859e489a6ddc40ea5b2bde9e135637 SHA-1: 4ed6401ba04b10b797027eb0e57c1f797790dbbb SHA-256: 0c5fe631ff38e203bdd4e6831ad68fb96063e8b69a7f8916c0553656ab53cf02
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least two identified as malicious redirectors or part of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a phishing or malicious redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cctraff.ru/123?utm_term=journeys+grade+4+pdf In PDF document text
    • https://xotituwidekave.weebly.com/uploads/1/3/4/5/134585458/guduzalagowag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5f9c5de95ba19.pdfIn PDF document text
    • https://xesofawerokiju.weebly.com/uploads/1/3/4/3/134356335/53b8a46d6a4e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5faa749fde424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_5fd9e80c5b54c.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/3adf6.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/migivewuwe/battery_saver_apk_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfaebe00-8805-4518-8d4f-0794e0cea9d6/sazinuwikujodelekafuxafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cbee17-f49e-4765-8c25-b1743e872889/rejamegoregakijafadogezax.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/budesiladedinuf.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/35384501576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04046752-6228-4b10-b4ed-869b0b46aa15/book_of_gad_the_seer.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/81116804932.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_off0000a8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D5 5112 bytes
SHA-256: 5f4168aa52a1e2f3833ffb243cca60810701f0b758bdfa50a72c539981202ab6
font_01_sfnt_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 9756 bytes
SHA-256: e89b3a1c7ba96c405a6bf220e5f61bd24755961c3b34ff6ba5b0b7d13b1162a0
font_02_sfnt_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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