Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bea8df6fc81cbcf…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 13:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64c4544d7fcc2bc878474440a2b6f476 SHA-1: adfc918ba27c5369244f5e313591241ec360a761 SHA-256: 7bea8df6fc81cbcfb9cf0efff810bf59d05fea4375dbaeef78e22f6acd4e2220
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to disposable domains, suggesting an attempt to redirect users to download unwanted software. The presence of external URIs and the nature of the embedded links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=browser+downloader+apk PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/93751918645.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/kakades.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/kaxilinonakesifamegomo.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/nevolawelifuva.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/ronapewe.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/29543936816.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/39790786377.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bosigawavukefa.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/52848825057.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/derezate.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/witiwumujeva.pdfIn PDF document text
    • https://ratodua.com/contents/files/zewisasijuzemuxozex.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/25695371188.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/momamumezeni.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/46203528984.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/1525902616.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/57989962635.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/dbbc4b292b75d08d8cb9f5e19c304783/bidevogosodakeraluwi.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/70591359989.pdfIn PDF document text
    • http://www.springperfect.com/upload/finder/files/voxotatatoji.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/bapuwosozutomanefosi.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/76064095037.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021972245449327.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/mifizowolegazoworuka.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_off0000af1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 10428 bytes
SHA-256: 737ec8c81df815e579e5297bcd33e1085b8d965d3b625213b35344413bbf33e1
font_02_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 16180 bytes
SHA-256: 66cd0afd460a9e743d43237d839f7053ae966751cd85c12a44f11afc4ad07cf2