Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca2981f577dc954…

MALICIOUS

PDF

86.0 KB Created: 2021-10-06 16:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a18d6763b9afeb88e8612132011d35a0 SHA-1: 24070e6298386f745fbd74df886c316ad6c5b676 SHA-256: 0ca2981f577dc9544f09a07b9c437c96c6de56c6bafca061d393b09309547de6
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, indicating it functions as a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of many distinct hosts suggest a malicious intent, likely to distribute further malware or conduct phishing. ClamAV detection and ML classification further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ysenb.kr/board/file/editor/file/58007246325.pdf In PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sebesoboxovu.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_085249.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/79901148247.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1615d6a915cc6f---wivux.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/41635747167.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/zisurejovabupebuz.pdfIn PDF document text
    • http://farmina.ru/uploads/files/65711193661.pdfIn PDF document text
    • http://autodilygood.cz/files/file/nilotebadunufup.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57021761212.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/14219406530.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wafotufewuvox.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/34844349026.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/83371106532.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/giwedepuwigunidefe.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/63088091173.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/76901931096.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/xozoxurujiw.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/32797424454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nox+how+to+install+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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 10372 bytes
SHA-256: 2407a529f78a4535de2f8d2619a0b36859b7d94669902496e38e539f99bdf636
font_01_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 18832 bytes
SHA-256: 4c131b62157439294a42dead58e1af26607aa0cf88c65f75669b40dfdd7ab79c
font_02_sfnt_off00013274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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