Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66572cc5847aad5…

MALICIOUS

PDF

79.9 KB Created: 2021-06-01 20:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2b60225ff692d35abe06fffa8ac4d11e SHA-1: 841ae159e3ead46e7938d1a8c6edfa2c6617d5f6 SHA-256: c66572cc5847aad5a63489d87eea79619c13becf5ae10b32711b810e90b902d7
186 Risk Score

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 0.9998

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://huntic.ru/pbw?utm_term=phonological+awareness+activities+for+kindergarten+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417834/normal_6029af8b87c1f.pdfIn PDF document text
    • https://jodobape.weebly.com/uploads/1/3/4/3/134317169/497ff4bc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425909/normal_5ffa0d21b7de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_6031af1164d40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_60493f973e78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_60223e990a3c6.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/3454131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407756/normal_5fc655c135f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449397/normal_60593bcacb9d6.pdfIn PDF document text
    • https://tatudikugox.weebly.com/uploads/1/3/4/7/134738012/kiduwa_fiwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_60390cc5be446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_60249c34e1b5d.pdfIn PDF document text
    • https://felavonirevokod.weebly.com/uploads/1/3/4/6/134606430/pivuvexolemuwosafa.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/9773571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_602072ba0f680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeladejan.pbworks.com/f/ec50_vs_ed50.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/22171886966.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144467700/adjetivos_posesivos_en_frances.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/w/file/fetch/144422865/60025668458.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/f/white_christmas_jazz_piano_sheet_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 5632 bytes
SHA-256: f6021125e6b2ec8cda50ebb23f8a1557d70afb0193ec5b357784f0c56cc5ece7
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 10588 bytes
SHA-256: d1543a367ca5e7712dd9a883338cb937972033b07d274508318925bbfa08434d
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b