Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc95885d9593ad13…

MALICIOUS

PDF

66.7 KB Created: 2020-12-14 04:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 13a25a76fe0b424cda444923c10b80be SHA-1: 95818e6c369f5e8f9a3ad1c45d6b8368df10aaed SHA-256: bc95885d9593ad13f939afa5df9bdd347df1303a3fa99b91fb647287321a4f90
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://trafftec.ru/123?utm_term=download+movie+box+apk+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418968/normal_5f96e5752fcc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_5fc21f5e111b0.pdfIn PDF document text
    • https://kipigifusulip.weebly.com/uploads/1/3/4/4/134437712/waneg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453720/normal_5fcacb5c7ae48.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/fetefajimebufevit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fa748ba0f110.pdfIn PDF document text
    • https://wekonopu.weebly.com/uploads/1/3/4/8/134848362/c07bd099a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483870/normal_5fad3617202d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fceb66b4ff20.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/xunilukegez/tefovoberutuxepunidiredap.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/software_architecture_in_practice_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/words_with_double_ll_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/superficial_venous_thrombosis_treatment_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/nibigisexedizegugux.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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 5544 bytes
SHA-256: 596bcce883c5dbea8bf3e98d84f14d77932c55e06d396460b80eec4464f4e923
font_01_sfnt_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 10032 bytes
SHA-256: 3f855c3adb5e4a9c6b7ec56a8705984704bd0472ec65cb6d900d6a08f4318c21

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