Malicious PDF — malware analysis report

Static analysis result for SHA-256 455ee8579a80face…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 18:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10ef5d8d91aa4727b003659c466191b2 SHA-1: fcbb03380798ec4817b646313255e32cf5a759e1 SHA-256: 455ee8579a80faced65449b522c8588223cd4c8d32e48e9ff5bdb373752403d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hladonural.ru/upload_picture/wiweg.pdf In PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/surijap.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/33010962086.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/93925585751.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wavaxudedejotobip.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/gozuluzadivipepudu.pdfIn PDF document text
    • http://steinemann-ag.ru/tudaxiba.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/10143925558.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/jufuxujexitawur.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/50936722123.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/20919310286.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/4853618879.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/35210453717.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc865825a---1728162287.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/62174665600.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/xazogusajefafe.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/37837618093.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/gomikanuzeparewanudefodo.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/duduzuzejujejo.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/54673060093.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/40110973247.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18068351675.pdfIn PDF document text
    • http://yibetter.com/data/files/sejejafixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=outlook+email+not+syncing+with+iphonePDF 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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 17920 bytes
SHA-256: 2ed75da33d9e1f1748f5aaf0c1c6d8e39c96d5ce987946c7ec05a070eb06b91e
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 11140 bytes
SHA-256: 46d161dbcc9932ecccf038db44889042ac4562a1b0c618c04f8e45f2311546ee

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