Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0c88ff95f9d083…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 20:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e91cf1ebcaedfe17d7d1de3555e7b128 SHA-1: 37933b53fe8f60430eae25b73794c6b1b31854d5 SHA-256: 1d0c88ff95f9d083bad0b98e1fa99ea28e81ad43ba9ccc22247e485b4f433867
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external URIs suggests the document's primary function is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=gefen+hdmi+detective+manual PDF link annotation
    • http://mygotour.com/FileData/ckfinder/files/20210902_AD6AE38C8F8E6470.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/xejonato.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/31221468722.pdfIn PDF document text
    • http://sun-tes.ru/files/file/70138137683.pdfIn PDF document text
    • https://mangallagn.com/images/file/58102506785.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/69331259240.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/masupi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/620930390613099bf29063.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613027201b1bb---wemipafilikofadepeso.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219434599683.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/gudix.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/98980561673.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cf23f949---ruxifigofav.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109071752199961.pdfIn PDF document text
    • https://gornjastubica.hr/files/fururabifumupoguti.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/rimakunujepovejevadigif.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/4394571948.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/87700780094.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/35185828074.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wuxobijuloxi.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/8664662175.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zogaxejamatiduxovon.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/12922714093.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zemazog.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/18121258775.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/23428985077.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://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_off0000c389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC389 10560 bytes
SHA-256: 0c2bdb1dd9563ecf1290ff2afeadccaeca8da1d7b852affba77193219a854afb
font_01_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 17232 bytes
SHA-256: 9ad8bc135eb4913449003c99eb57c336ea74b62e50b909af1d27d5e673046d59