Malicious PDF — malware analysis report

Static analysis result for SHA-256 31605cc0a500b573…

MALICIOUS

PDF

62.3 KB Created: 2020-11-19 02:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1ca792e66240d03fa3b67d2228855cf0 SHA-1: d8c1600ac4bb8cda44f6a69461e69a51569f6dee SHA-256: 31605cc0a500b5734bdd519d8c4d6fda67e9c146c3e3c253721ccf40ce3c645c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=roblox+%252Fe+commands PDF link annotation
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/8025893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_5fa6f3a69a592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fa5faa6e1285.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/e1a6a889073e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8847fe8c6da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f9ef39f4cc3c.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/gifiz/88979833472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91c1ec6-74d7-4572-86b3-79a651a9eaaf/universo_juiz_de_fora_espao_do_aluno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244b26fb-dbd5-42c9-98b3-def1f5a95c6c/mawotimezitelujuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa377de-1cf7-470a-9001-387af630f99b/4752434229.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/borderlands_grinder_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720a6958-ded3-497c-89ee-f6c9ff44e3be/71111064285.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/rewasixatovanedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b83ffc8-4a0a-4608-bde7-486fb0f8f68f/56611546226.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/free_fidget_spinners_amazon.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB899 5240 bytes
SHA-256: ed1cd72b36148f4838af7e12fd32a47bed8c9e118416a081224dab72a86d9517
font_01_sfnt_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 9868 bytes
SHA-256: 8cce3548ba86cea39637e6e22b3268e8721432b7c2e9afd1ae2bd119760a27db

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