Malicious PDF — malware analysis report

Static analysis result for SHA-256 392daaa47dd2147b…

MALICIOUS

PDF

75.4 KB Created: 2020-12-25 12:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 49c42615c712b77b26fcb91a102afb08 SHA-1: e8a8905fe8f6162ff67a856053a4191f89cba829 SHA-256: 392daaa47dd2147b8de9f60db771a8edcc1d9e575b94b4b714ea9c5e889bf4c8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://trafffi.ru/strik?utm_term=business+startup+costs+deduction PDF link annotation
    • https://ritakixe.weebly.com/uploads/1/3/4/7/134745902/lagisa-dagizalog-zinax-razisoz.pdfIn PDF document text
    • https://timurikamaz.weebly.com/uploads/1/3/1/4/131406182/75026ea763.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/9423542.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/boferebefeduzajuwa.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/tokasomegobe-kosoxal.pdfIn PDF document text
    • https://pomudada.weebly.com/uploads/1/3/4/3/134382041/tikoposuzuku.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/d5f97ae8-a144-4a57-9c75-f06855e3ebbc/36499081765.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/52743155726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd23554d-df20-4b40-8d07-a7d4f49f7ea1/combat_fighter_system_free.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 5084 bytes
SHA-256: ad38653046387f40792e23af266547e98a75ee5c3e8f4cacf7d9cee67cacbaf4
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 10940 bytes
SHA-256: 00981bd6fcd605a1e073d24fcbc4662c635322a3ce50cf3cd34010d87a41c1a5

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