Malicious PDF — malware analysis report

Static analysis result for SHA-256 888fd67f9679ecd2…

MALICIOUS

PDF

97.1 KB Created: 2021-09-20 16:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b81a5813efc2fd405ce692022967168 SHA-1: f792efb0956aa11ce2bfebe654dd77bf71dd28e9 SHA-256: 888fd67f9679ecd287a7ff87e0a0bc43022ec2fb4effed029c60a6860b1ca3f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a link farm or phishing campaign designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=my+hero+academia+the+heroes+rising PDF link annotation
    • https://ceccarmaramures.ro/userfiles/file/48123093495.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/figejexazaxamaxoma.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/rafowujepuvixiratexivawo.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/43452459282.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/8537581721.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/feletowixelar.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/99353317340.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pidewofirebeziwuxir.pdfIn PDF document text
    • http://cosyromania.com/media/file/wuwibeguzu.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/10537296163.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/54441770455.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5dde6d74---positedabewiva.pdfIn PDF document text
    • http://cutskytools.com/d/files/91848531293.pdfIn PDF document text
    • http://3sdent.com/upload/files/72806280186.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kuwikovajapivoju.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/dazenawikipopipi.pdfIn PDF document text
    • http://freetds.net/userfiles/file/86644642541.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/44088491400.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/sovezulelokebitusarilet.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/38217220043.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/wotitivazepabido.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210919131127.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/20640642849.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_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 23356 bytes
SHA-256: 3b1e716c4abd06600ef6ca8814b28ab05ea7447e3c334519282d2ca7b1d22ef8
font_02_sfnt_off00015e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0A 10876 bytes
SHA-256: 0b51925caace122cdc3c587fa53aae50ee110933b06f1d2356102549a4733b2d

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