Malicious PDF — malware analysis report

Static analysis result for SHA-256 f547a1277f5d31e1…

MALICIOUS

PDF

70.0 KB Created: 2021-01-13 19:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91327d93df1bf55446f98618e21244e9 SHA-1: 901961b8e2379d78f6e8ef00e532b3ea122ab78d SHA-256: f547a1277f5d31e13c49a9066f94461efaf87c06b7c7de474dd5ff90f55ebb08
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to direct users to potentially harmful external sites.

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://trafftec.ru/aws?utm_term=footsteps+walking+with+me+piano+sheet+music PDF link annotation
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/8308064.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/ggjfjjr/wwe_universe_mode_tips.pdfIn PDF document text
    • https://site-1179443.mozfiles.com/files/1179443/rukozogevodupuz.pdfIn PDF document text
    • https://site-1168371.mozfiles.com/files/1168371/97064199096.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/jghYgcG/zoom_cloud_meeting_usage.pdfIn PDF document text
    • https://site-1175753.mozfiles.com/files/1175753/hackers_definition_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/ejjUKvk/telemundo_47_noticias_nueva_york_en_vivo.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/8NUWSe6/94168256129.pdfIn PDF document text
    • https://site-1178444.mozfiles.com/files/1178444/electric_guitar_brands_logos.pdfIn PDF document text
    • https://site-1168101.mozfiles.com/files/1168101/61029136233.pdfIn PDF document text
    • https://site-1234924.mozfiles.com/files/1234924/costco_canada_callaway_golf_clubs.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/dgjLKp3/lebaran_2021_jatuh_pada_tanggal_berapa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 5364 bytes
SHA-256: 7925379dc36625c65cab70da8ce47e215a69d971c11cfb861ebb29cd239ff451
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10092 bytes
SHA-256: 2938d707cb7e9c744b11241972cf098e1c1c1eced1171bd8b2347741dd860c3c

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