Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3e1a0d54bae02e…

MALICIOUS

PDF

64.9 KB Created: 2020-11-25 02:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b3797244d74ee5abf71663b4f2721499 SHA-1: e2c1017ac9d92d58c011c86f4aaa8d0f390cc327 SHA-256: cf3e1a0d54bae02e3fb004af70c2e7315af0d767a174b1676e7ec2608f39a441
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious activity, likely related to directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/strik?utm_term=haz+llover+jesus+culture+chords PDF link annotation
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/47bc6529ec.pdfIn PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/wafejaritisa.pdfIn PDF document text
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/kojazew.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/35b50.pdfIn PDF document text
    • https://nojezedefefowas.weebly.com/uploads/1/3/4/7/134762002/3739133.pdfIn PDF document text
    • https://tumegifokax.weebly.com/uploads/1/3/4/2/134235775/0fbbe0aa5457e28.pdfIn PDF document text
    • https://sasenepekevob.weebly.com/uploads/1/3/4/2/134266747/xujomodagadodu-jekolove-poveresir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_5fbc247e1e08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5fae8ce4458e5.pdfIn PDF document text
    • https://munulibur.weebly.com/uploads/1/3/4/5/134508804/2748870.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/7d5edcff94eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5f9d2b4b63faa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db985c7-f342-4afb-bfd0-508a0d276e35/tugegafamulumakib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79230083-40ec-40ea-aaa4-ba2e2fcea098/crafting_guide_mod_1._12._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933752ec-5db8-4b56-89ea-db7b83f6e0c2/jobevoxewopukupawivekuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2992f504-359e-4396-b9fd-3e598170fe84/53849499804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af4bb85-7c76-4963-a607-0fd2dd6e2d74/65929164938.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_off0000bdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 5176 bytes
SHA-256: a7beb1ca55e601b4858d4af358131707aa259e2d130d53b2e50337bcfc983ef7
font_01_sfnt_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 11192 bytes
SHA-256: 1073de03e62f8fed63754bb540f98bc59fadeabd5e170b8c4cbb3c8101146b1b

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