Malicious PDF — malware analysis report

Static analysis result for SHA-256 427ffe23cd199ddd…

MALICIOUS

PDF

72.0 KB Created: 2021-01-10 00:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 43f07e9aea3ce7758ce60447b5ec7753 SHA-1: ecf6275fd41fa9e83c517cf6d78a3f7c24484d2a SHA-256: 427ffe23cd199ddd5182c32797a8123a3a61987dd86590e85cf015d65736224d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

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://trafffe.ru/aws?utm_term=kingsland+breeches+size+guide PDF link annotation
    • https://site-1171498.mozfiles.com/files/1171498/baby_names_for_girls_unique.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_5fb9995a9a2b7.pdfIn PDF document text
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/ce029e.pdfIn PDF document text
    • https://sunenuno.weebly.com/uploads/1/3/5/3/135319001/davokidolupow.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/2238080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fe0764fba1a9.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/dmV9hes/23958783716.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/uERhdSf/top_bike_racing_moto_drag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5fc2112ae7e1a.pdfIn PDF document text
    • https://site-1168242.mozfiles.com/files/1168242/retro_arcade_store_discount_code.pdfIn PDF document text
    • https://site-1168377.mozfiles.com/files/1168377/19359885549.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/119261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f96de04e105a.pdfIn PDF document text
    • https://jevefelenop.weebly.com/uploads/1/3/0/7/130775498/teligukedurufuzij.pdfIn PDF document text
    • https://dojeviwenos.weebly.com/uploads/1/3/4/4/134491393/naziz.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_off0000d1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BA 5360 bytes
SHA-256: ffb2947602d2dd6bff28af90327acfe3234699f88bb5095515182ea27c2e8deb
font_01_sfnt_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 15380 bytes
SHA-256: 0b973a5e0100993e9c4f5d53e576ce0197cbcbc381b0d7fd9117467e853931ad

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