Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce50d9770c7ae8f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 23:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2a86bbea6b7ed568aae25277ca9f592 SHA-1: a41984f999e408a66809da5eb293882da6986963 SHA-256: cce50d9770c7ae8fb584f1f1a38b37c156600fba5f9b8cf27dbc1832d9339b8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://globalfeedindustry.com/upload/files/zejuwilejatef.pdf
    • https://itscebu.com/upload/file/20210924211334.pdf
    • http://margheritango.it/userfiles/file/balagazojavaxajokowano.pdf
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/gezelebiloguzekewimo.pdf
    • http://usairsprings.com/userfiles/file/zepumigiravifuwozub.pdf
    • http://robertoantoniz.com/resources/original/file/lumomo.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/71376970232.pdf
    • http://lepetitjaunais.com/userfiles/file/fetola.pdf
    • http://huh.hu/UserFiles/File/sinisogab.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/39362490745.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614059a7e8b60---xexikabubefarumozisom.pdf
    • http://umhouses.com/uploads/files/88893889781.pdf
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/26794693196.pdf
    • http://wernitznigg.at/files/50045161199.pdf
    • http://gadkowski.pl/repository/filemanager/file/newokapetikufekun.pdf
    • http://houtackers.nl/userfiles/file/11255674157.pdf
    • http://aleshashop.net/uploaded_files/userfiles/files/dakoriwijafibirowabat.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2f98c4a2eac623c9989664625f04fe9e/wejonerimefefedivi.pdf
    • http://kunjipsc.com/uploads/files/37459615588.pdf
    • https://ratosatu.com/contents/files/jijumegexofuvopafos.pdf
    • http://oresteruggiero.com/userfiles/files/50577498275.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+set+text+color
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acc3.bin
95faedcb29dec31475c4b84c253b66de385e3e229668805ab439eb2e04425d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC3 10284 bytes
font_01_sfnt_off0000c408.bin
d41e2919487c6a647edc8b38449e926dbe2a85229bc928a15c5c439eda9693ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 15504 bytes
font_02_sfnt_off0000ebae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAE 16792 bytes

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