Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac0a50410f264fc…

MALICIOUS

PDF

80.5 KB Created: 2021-10-06 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e933475d68fcb6fa127f1b549a39e357 SHA-1: ef4f4d11aa09ea47488d0749bc98a97e2691bfd4 SHA-256: 5ac0a50410f264fcfe3d10fbf021a13cf55d7097b320d532a9eb701a788de849
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://xn--h1acbpobggs.xn--p1ai/data/files/84097950808.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5de6cccc---13021069054.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/21514131151.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/winizinufejufakid.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/domegusagipexojaxobizi.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210905_6CD225FD417789DE.pdfIn PDF document text
    • http://guitarenko.fr/img/files/pevate.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155cea3e13c3---90484615257.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/64309268105.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/59979928166.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/pusiturivowivusipepi.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/wovijisinexiregot.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/18104440612.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/nikixulubizala.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/39272449425.pdfIn PDF document text
    • http://seamacros.com/upload/file/6541590759.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/85303844476.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/18191624668.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/tulut.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/84598501631.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/17033142637.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/pekebiparokuxiwabivede.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/85206506080.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/68374629400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=from+blue+hair+to+brownPDF 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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10508 bytes
SHA-256: 9eefee08ceb0e72d7a5744d3098310185154e6edce9810744440cfa24597d5d4
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 16832 bytes
SHA-256: 543ebbc5c80f562cd87c37040b0e74d48db07acc914a70b91550c21467ed52e9