Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9d33e1ef404380…

MALICIOUS

PDF

74.5 KB Created: 2021-01-09 23:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3e256ea6416d2426cf592001226a3b91 SHA-1: 1e6fb8f7727db46b2d6149e0e3cc6df777f3622e SHA-256: 6b9d33e1ef40438008c662481fbd71ac77939ddd36e156c158cdda5278fe2c11
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. This is a common tactic for phishing campaigns or distributing further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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://trafficel.ru/123?utm_term=flip+ultra+hd+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448750/normal_5fa550d7ae430.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/dukukaxupif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447906/normal_5ff4a5a45fded.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486537/normal_5fd03daa9be65.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/hjg9Ffs/2020_solar_eclipse_path.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/hg2hdQE/boulangerie_meaning_in_french.pdfIn PDF document text
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/3175083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f87f527f2f37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fd08876a7bd6.pdfIn PDF document text
    • https://polivepuba.weebly.com/uploads/1/3/4/5/134582029/lurerunupozi.pdfIn PDF document text
    • https://filikegepux.weebly.com/uploads/1/3/5/3/135346592/toredi-lufix-zimasemalerosej-kokosola.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/SQT8Ctn/63199850684.pdfIn PDF document text
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/6d7b6.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/ojfMU9v/82418333046.pdfIn PDF document text
    • https://muxoramosuzuveg.weebly.com/uploads/1/3/4/2/134266249/denagexibuditoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_5fb66f14d8a0b.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_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 5116 bytes
SHA-256: 50a6331657798c3138fbdffdf690960f916bd13cf25255f20cc3db08cbe357aa
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 11600 bytes
SHA-256: b5e2c70042e72dc7cb38c6abbc6d3a57fca2cef3fd7fd5e40435d11390b48bfe

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