Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be6cda8ad4dcb0b…

MALICIOUS

PDF

61.2 KB Created: 2020-11-16 20:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 95370f19c79acc0ebdcd9a872cb3881d SHA-1: d0e7a50766ca9642e0f9e02f8791d8e519ee992e SHA-256: 6be6cda8ad4dcb0bbaaa7631bf20ff7f1674beb47c8ad8c00f327adc96bed385
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=bir+ses+b%25C3%25B6ler+geceyi+izle PDF link annotation
    • https://niliwuwez.weebly.com/uploads/1/3/4/2/134265541/3daee10d040e.pdfIn PDF document text
    • https://pitamiled.weebly.com/uploads/1/3/4/0/134098016/difidusidu.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/457a29a.pdfIn PDF document text
    • https://foxagizak.weebly.com/uploads/1/3/4/3/134332010/zijaridegunonitaw.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/70d98076.pdfIn PDF document text
    • https://nurixuwabojud.weebly.com/uploads/1/3/4/5/134587723/b792ec2709a60c.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/dofod-nedowula-wekijobiwupalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudowo/faxadixe.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/87060902641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47488801-7fa5-43d9-abc1-b68370281c85/lewaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8f11c4-2ab3-4513-82cf-e423d5a54d82/bksb_functional_skills_maths_level_2.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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 5236 bytes
SHA-256: 9f71c4da2f3783b7c447be7ac69f3758ca9034717f34cbc1ff1fd522f9999a02
font_01_sfnt_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 10800 bytes
SHA-256: c5234e8bda00a1e2596dd169d75bc56a45c1f03729e2469926c99a47f06a98c0

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