Malicious PDF — malware analysis report

Static analysis result for SHA-256 670515e8b057b4cb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 05:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a31565d85480cd1839ddb8012e234ce SHA-1: 4e4b29d6c9835e9115684402cffd7f8cfb4ef4eb SHA-256: 670515e8b057b4cb9e001cb464ae74646b503d4abfc16bdf46661c67074a6c8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, hosting numerous links to potentially malicious domains, including one that appears to be a redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=android+security+update+february+2017 PDF link annotation
    • http://centromedicoveterinarioadda.com/userfiles/files/xuzesasenoperesukagezo.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/vukikurutidageluwoxoja.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/47620047133.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/67493139785.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/jaronivelulajobodajaxuk.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/87485573963.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/robarirojizegoxepo.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210923112030.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/noxazutigeduvo.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/59502141254.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210906214932.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/wutapuwowogumowukigutipaz.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fakizulemaf.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210918080126.pdfIn PDF document text
    • http://cl-pub.com/files/files/19392793923.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370739dcb44---tikisoxinosofaj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/186o28m44uvtr9bnu2hji8leqg/84594819508.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/nutotokuneg.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/28417958852.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xabogutunalexasatus.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/vozafepilopopefamakos.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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 11248 bytes
SHA-256: 128feeb951622eae2a4670d417a13327181a51c625b689ef46a36b6c4d1433a6
font_01_sfnt_off0000c9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 15912 bytes
SHA-256: 478cc058cd7ba2f640ab0d2d5c5b3ae47983315a46795930332f67b3b52cea25

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