Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7a0944741d12fa…

MALICIOUS

PDF

79.7 KB Created: 2021-02-18 01:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 947b22a46baf6f988d9163122bc21749 SHA-1: df570c224244af043c95a69b17f8408f38f8f0b7 SHA-256: aa7a0944741d12fa5f6cf0b0024d6ef77dec8ad0946d318a8241f60f741104f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/123?utm_term=forever+maggie+stiefvater+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470821/normal_5ff9ebb3780e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_601b3d09b1d81.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/tghhhbo/solid_color_wallpaper_download.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/8849877.pdfIn PDF document text
    • https://cdn.sqhk.co/xikotoxerov/gdif78a/usdx_wallet_blockchain_wallet_with_stable_cryptogram.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/fodapuxokoxexisimape.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/wamudogiwuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5fd3c225c1cbb.pdfIn PDF document text
    • http://mutodute.22web.org/pagefimixow.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jj0igxA/besemojuwejafab.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/5c2e35f.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/141262.pdfIn PDF document text
    • http://kvrovk.xyz/94369625633uddpp.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/hibhhje/49822352576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafilijesov.epizy.com/98573971871.pdfIn PDF document text
    • http://wagarimorule.rf.gd/bodoni_classic_roman_font_free.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_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 5172 bytes
SHA-256: 4418b74aaaccc6d056f13591d1267178d959140f7868049ded53350ce3bf6579
font_01_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 10080 bytes
SHA-256: e253f29e0e80512c16a1f22f6660bbf1392f354c15f73cb62a1eeb0f2c76fee9

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