Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f74a2e0e78d336…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 09:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e3d21a8f255ad1e109d00ec3144505a SHA-1: 1fd69959ef21014f3723a3c527a7db4905a89449 SHA-256: 78f74a2e0e78d33638c12fbffd3c1b1cdacea35baa4627d523844c35851c116d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://506hlapeta.com/files/file/29906283767.pdf In PDF document text
    • https://rowsontw.com/shopadmin/upload/files/74407079394.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/rukotagamevomel.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/kapijebijetit.pdfIn PDF document text
    • http://contelex.it/userfiles/files/sivefekafagavarose.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/16074840591.pdfIn PDF document text
    • https://kede.org/userfiles/file/30455670885.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/nokozudupizolituxi.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/gozubuzixonusasumin.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/vozobabitatar.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/funomovefam.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nevumivunorep.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/visakuravip.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/26398167789.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rojiwoweda.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/tetalexidozowemifoj.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/45509683362.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nijuda.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/546489477.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/tuvife.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/kabafagotoxesorijeviwak.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/xugetidaxogisizolata.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/79106805941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=golf+clash+generatorPDF 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_off0000c32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32D 18524 bytes
SHA-256: 04f76d4915e8fcb8fb0bc758c7dbb2fbd1ea20be3d95ff68350b02c37d3321cf
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10560 bytes
SHA-256: 9229b776ce06bf093423e3a5400e67b57fabf65f09b93b5d1d219ea317117527
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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