Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53e88b80ca66bce…

MALICIOUS

PDF

74.0 KB Created: 2021-05-24 18:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfede1cca40818b32ca5c748661b6295 SHA-1: aa1aa5fcb5c5bc79aaedb9794f5af09b00be1f0d SHA-256: c53e88b80ca66bce77a40fe02e637388b6537c950412f08e50075702797183f7
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 0.9998

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
  • 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://kuzutuzo.ru/strik?utm_term=gabriel%2527s+inferno+part+4+release+date PDF link annotation
    • https://duvafoxugijotad.weebly.com/uploads/1/3/5/3/135305538/1887220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fe6a53978b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_6067ddc97b18c.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/2235733.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/guxar-dezisorol-kulimaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_606712e4f399f.pdfIn PDF document text
    • https://miganavon.weebly.com/uploads/1/3/4/3/134368237/zuwetosifozome-zefomitubogofe-migibibujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_5fd8e7a94aec8.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/tevigotu/katesuruvege.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/what_kind_of_oil_does_a_dodge_grand_caravan_use.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/rorudorasu.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/41618200974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc972b01-9295-45e4-b86d-2d1703e27c1f/59053982492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364d9aac-72f8-45c5-90b3-9fa1d7d246dc/im_hashem_lo_yivneh_bayis_remix.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_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 5328 bytes
SHA-256: 71480aea4e5c410a2885d14d10ca64c91abcf5c2bdcebcbec2993249c894d96e
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10284 bytes
SHA-256: 8e001eaab012c0b5ada670e6cdb11a62cce47efbc613e20ae378bb9d69f3506f

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