Malicious PDF — malware analysis report

Static analysis result for SHA-256 39adca874a26b007…

MALICIOUS

PDF

72.2 KB Created: 2020-12-25 13:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 37a915ce325cf312ae25eab6007edc7e SHA-1: 904b6824ff733982e59a6fa1bcd76ddb8eb25c25 SHA-256: 39adca874a26b0079d58d6fb6907231e3fbd3faa7700fd8d8cae5349820705ac
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 0.9997

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://trafffi.ru/strik?utm_term=instagram+follower+booster+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5fb5fa8e1d487.pdfIn PDF document text
    • https://cdn.sqhk.co/dojatejij/MrP3jcQ/77153824461.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/heY4ico/dokewaxajipiwubejej.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/wejavorunumebos-wetifiwenekax-gifuxopax-fupupifalapez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470841/normal_5fe003cc5f113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fc88b083a482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fe4b05c3665b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64bb7324ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_5fb259b5077cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d57ddbd-1f01-4cff-af07-a956d9572858/phrases_damour_et_amiti_tumblr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4c82f0-6314-497b-8a3a-b857d4437610/sopenapakaridusozoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e110bf76-670c-4e98-a2d4-1b994c08e1e7/freebox_hd_etape_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19141c0e-635d-4f86-a64d-a9fd8312ed4b/symbols_in_lord_of_the_flies.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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 5392 bytes
SHA-256: e682f8f478f100219cf52e5ab09e04394deb37737bf508992fef8694903d1de5
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 10340 bytes
SHA-256: d9ac3a973eb43a0df3df7043ea62901f9a7280344c8563481e7a6eb19eb58fbf

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