Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b6658dc9ba8a21…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 21:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d0752195a10916abc2c02c7de690136 SHA-1: 774056e2a30021fe86ee3d2fc64dfa424dd8740e SHA-256: d5b6658dc9ba8a210a85a8caa749527d5b69861690b5d175ced1277a27eedee1
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for multiple links. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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 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 http://vytvarnyobchod.cz/UserFiles/File/mudiloxokupajejepajuvubi.pdf In PDF document text
    • http://nyitotthaz.hu/userfiles/files/44542579342.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/13833834723.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-3/20210903152947228908.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/vomavefutabasizeg.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/22704031453.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/datajepolonitewabuxi.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/42329620079.pdfIn PDF document text
    • http://melvin.cz/data/zapofit.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/rozujesurexezomavopabuba.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/nuwarelovuvidu.pdfIn PDF document text
    • http://epplast.com/files/file/girisirudevo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/sekopotezoxederimamuro.pdfIn PDF document text
    • http://519pf.com/userfiles/files/wuxapeto.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/kopamotinijolepemuni.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/2836753836.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7fb304e81a4a2e96d5b082a63d60a314/71379445999.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/belefibidewikabopupozuk.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/roletuvuvisuredexipaxu.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jamejewisemugirowigeru.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/33781339610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=arc+anime+hunter+x+hunterPDF link annotation
    • 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://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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 10344 bytes
SHA-256: 6133a572c0cee14d38cd375064a425c6716f93a928d1aa0d1c0743d408cb38cd
font_02_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 17492 bytes
SHA-256: 62a433a18b30a993dc987b1bdddc5139f9577653e4ac6ba24612abf823515cce

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