Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dc2253bf7909ed…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 17:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5de0ee0f78f6dad3afe6c09ebbe6ee7 SHA-1: 77c77cca0c67180be092b293dc2030678ae00315 SHA-256: 86dc2253bf7909ed96e352082ff646fff17f4238de7bbdb8ac13bb13a7f17feb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142106f92df8---62912186720.pdf In PDF document text
    • http://max-metal.pl/gfx/file/62539615394.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/23873606576.pdfIn PDF document text
    • https://majubesar.com/contents/files/xuroweraraluko.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/57983995052.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/jigimu.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/66107394328.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/79444038917.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632828782.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/77486211196.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1855101a9913e441ac9f81708dce4624/26166766417.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30829639528.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/22175070431.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/32339577398.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/pamiweg.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/visasuwek.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/1924513090.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/78581288758.pdfIn PDF document text
    • http://hejia-ele.net/upload/14144855437.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/3948906999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hades+star+apkPDF 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_off0000ae93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A5 17120 bytes
SHA-256: 774a5c14affecc2e5d3ef6a5cc1dfce2d97e211168c45d26960eddf1cfe4e785
font_02_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10104 bytes
SHA-256: 54774619cbb426856479a54531f663260120d92faf277e05fbe0379923e91bb9

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