Malicious PDF — malware analysis report

Static analysis result for SHA-256 e778bf4067f7de2e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 23:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ea4b6ebefd12fbc7b8a7e04fec26336 SHA-1: 308eb275d2b6ac276e17dd53d47c7cc72741762e SHA-256: e778bf4067f7de2e64afb4c39b696cc329b6f54afd0ff55e50e66ae57e9358dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters for tracking, suggests a link farm designed to obscure the ultimate download destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/poloxanosigokuremifokesi.pdf In PDF document text
    • http://zeroseistudio.eu/userfiles/files/xutejibisuguviwidoka.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/tukapotajolulufumun.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xuwakisamididanoparej.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eafd6c9403---50382273061.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/wujegiwobaku.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/40248970294.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/8353778417.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/fowiwosebinidifutatonad.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/nesosoje.pdfIn PDF document text
    • http://elitacasa.it/images/file/84473601238.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46608449042.pdfIn PDF document text
    • https://harom.ro/files/file/92210516414.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/xasin.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/gefarenesibatuna.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0cb2e3d5d---18704855003.pdfIn PDF document text
    • http://fkhd.cz/data/img/loxavasapataxawomukiven.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/kewiwizafuduxa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/nubidu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/91988254589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+dream+league+2019+modPDF 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_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 10884 bytes
SHA-256: 92c3d38a70fed66bd94a70ff9ebf66caf4582d1b6e192d765c2549f0d14f1855
font_01_sfnt_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 17472 bytes
SHA-256: 4b7a23cf8498542c04a47f8b4d50f86ad0e7026164ba5f84ce44c18048010242

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