Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc8b0c2326eb278…

MALICIOUS

PDF

70.8 KB Created: 2021-03-01 21:55:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c601b52edcecfb0dd29a455db52a4d62 SHA-1: 92ba452a513eb1065ab17822eda425aa38c562c5 SHA-256: fdc8b0c2326eb278ed20b16dd62abca4c0eb0114bbb9a9b2d5c889609f3cce98
126 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=stihl+ts420+carburetor+cleaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494657/normal_603357e89bdec.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/6a7e5639.pdfIn PDF document text
    • http://yazansoft.com/knight_of_the_black_rosen50qg.pdfIn PDF document text
    • http://unonatur.space/4388509572f473f.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/a495091a.pdfIn PDF document text
    • http://netewe8.xyz/beyonce_knowles_songs_freegaivp.pdfIn PDF document text
    • http://3bureaureport.info/photography_lens_filters_guidecvulb.pdfIn PDF document text
    • http://getsol.xyz/roxegiwiwufewufudugosaxyfxo.pdfIn PDF document text
    • http://veronaital.space/duvafikosetekiz2qlyw.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/viwebavaxusujazibedinekis.pdfIn PDF document text
    • http://thepropheticapp.com/xesenawoz86aq1.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/9704347.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/jotogorurekuro/master_asp.net_mvc_core_3.1_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/funenotulobomum.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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 5664 bytes
SHA-256: 9a2bc12921a73b375c51dfb55510e006ed7d9e115929209f27374cea03d5528e
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 9892 bytes
SHA-256: 462098993286876456280d9ef38722476c0911f8cbf062d612611ab66b144865

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