Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3f9eb3b8b0218…

MALICIOUS

PDF

73.7 KB Created: 2021-02-24 07:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 12fcd490a7b263bfcb7eac30f7e7103e SHA-1: dda62fa4245bb610c1cdb13b1464912226e4eab1 SHA-256: 5af3f9eb3b8b0218853412cbff8424ccb88e5899965ef3b9bf5a333ac53e1614
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'smoke and carbon monoxide alarm manual', likely to trick users into clicking the embedded malicious URLs.

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://seumenha.ru/strik?utm_term=first+alert+smoke+and+carbon+monoxide+alarm+manual PDF link annotation
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/5287260.pdfIn PDF document text
    • http://gididowofugu.iblogger.org/70951458946.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/bejamegisevu-wotiti.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/tepotozesal.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/gewebaj.pdfIn PDF document text
    • https://wufezaju.weebly.com/uploads/1/3/0/7/130738917/6510429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6016fc53708d5.pdfIn PDF document text
    • https://jukewamozaf.weebly.com/uploads/1/3/1/4/131438013/50080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6017b565b1d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_5fe938dd0bc33.pdfIn PDF document text
    • http://itabody.space/35777796470a8kjz.pdfIn PDF document text
    • http://kutalevewomem.22web.org/rokekonujemosomakow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_6021c1d5b5bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_600fa741eb306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gulesovel.epizy.com/iphone_says_guided_access_app_unavailable.pdfIn PDF document text
    • http://sapumazolexu.epizy.com/korean_airline_news_report.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_off0000e160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE160 5312 bytes
SHA-256: 21ea5a42d0cf63aa603242d19d6688a89f3961aef8eb675b3156f7fc38c7fa74
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 11104 bytes
SHA-256: 2181db9c5c1556dc17dd3dea5085e505551afcdeffc2b9ee858de84a23b6773a

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