Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa246ed68d26adfd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 16:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94f2d557d4580b9ed170aa2ed836ad33 SHA-1: f41cf2a62ca50cfc236e8071fe47356463c73939 SHA-256: aa246ed68d26adfd611268cc8d6591f4b393b83c162e85b1d268420565e6e5bc
146 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, with one notable URL pointing directly to an IP address. The presence of these links and the overall structure suggest an attempt to trick users into visiting compromised or malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mongolia-volkslift.com/uploads/files/wewuk.pdf In PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/44164671844.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/garapipuposeneritili.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/79047598.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16151896dc4d86---25769307891.pdfPDF link annotation
    • http://netart.hu/userfiles/file/kasaxel.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/zegusigakazepevuwa.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/4773749185.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631026640.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/74046551162.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/jofigot.pdfIn PDF document text
    • http://caythuocnam.org/images/files/95382358892.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/kozer.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/ruxaperosoxabaripopodu.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vunoz.pdfIn PDF document text
    • http://schubert-hh.de/image/file/46100623131.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gijukanowafiwijanor.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/484d3deucpm3n9o4cnq0nkh3o0/36397694201.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/golesovadogodekaw.pdfIn PDF document text
    • http://voijin.com/userfiles/files/25835933879.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nisibu.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/65678478295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+v+bucks+hack+generatorPDF 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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 15312 bytes
SHA-256: 0d6d9ea536f67907b5d2520cf2a2afa8dc674a47f68fa0724538c4d3acaf8ffc
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10744 bytes
SHA-256: ea9f7a884a3c02d371390c2b92d33cb1174d5fe1a2e70b1fe995846ca75a7a63
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1