Malicious PDF — malware analysis report

Static analysis result for SHA-256 71022eb4149e32a8…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 13:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5ba38e9a84c4d5dec71d04da7cfd0d7 SHA-1: 51317167d6680b63df68431b9ff5de30b50253fb SHA-256: 71022eb4149e32a806c273cd52e9d445c8fe5591827f4793307561b8cc3b9033
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains malformed streams and is flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, indicates an attempt to execute malicious code, likely to redirect the user to one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://abzesolar.com/uploads/files/leretozugin.pdf In PDF document text
    • https://rlmahtani.com/userfiles/files/22013962208.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/44585041838.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/26290772833.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kitananutivij.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/85575923118.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/93850920734.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109200728508047.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/33442641776.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7313e923bf579827ff94736509fb1ef/pesubibixivu.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/77103041900.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/84849385255.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/15489312769.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac2f2731f---42135572865.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091104460938.pdfIn PDF document text
    • https://sentralperdana.com/file/31475029567.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/24855122227.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/xorap.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/44895574761.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/xepifoziloxemarekorodo.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/81742727368.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/49290804038.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/81620413654.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/39670647033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=market+leader+pre+intermediate+practice+file+pdfPDF 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_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 10580 bytes
SHA-256: 06f02d5ae9329a427f3a27fa96e8392105f5a236f6ecbe25c9ec1aa5e07d091e
font_01_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 15492 bytes
SHA-256: fa7f34a2186d8a39460435ee8698e2865de9203546f20c0204710f9605bdddf5
font_02_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1