Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf58a2c30774758b…

MALICIOUS

PDF

75.5 KB Created: 2021-02-28 13:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9a58cf1d12f040c4dab6edd52d91d3a4 SHA-1: 27f1f65bcb92f15b7d1baa9e7b967878889b2973 SHA-256: bf58a2c30774758bb5b90ec607362f99275fe1b732d7ed2e58a2e9ba80056fa1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious or deceptive content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://golowaki.ru/wix?keyword=russian+tortoise+food+list PDF link annotation
    • https://cdn.sqhk.co/febenapox/gifibhb/color_fill_procreate_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/eibigic/free_sheet_music_love_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/gUijtia/english_to_spanish_online_translator_job.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/msi_afterburner_free_windows_7.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/4953409.pdfIn PDF document text
    • http://dkblogin-de.com/cabify_vs_uber_preciosxzurz.pdfIn PDF document text
    • https://cdn.sqhk.co/semejegofip/nUjcYVN/37006443272.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/gihdzvX/1396423559.pdfIn PDF document text
    • http://blancop.xyz/50413163077hoeb8.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/bipaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/zilokaboxa.pdfIn PDF document text
    • http://suxanovovogemi.rf.gd/behringer_x32_core_manual.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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 4908 bytes
SHA-256: 17494727149263519bd8440256fa7a9730f4b0006b7e297a3e58a02c4840996a
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10312 bytes
SHA-256: 13da8623b56069469975e70aff861d581029e4e42ca1b9b58d95b271ce8f5746

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