Malicious PDF — malware analysis report

Static analysis result for SHA-256 210686e74d353dc2…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 23:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b0e987c15735774db2c1cba1c668be4 SHA-1: aaa6189b271862f33f365f1bd1a5dbf94bf8c542 SHA-256: 210686e74d353dc2134eb1a1bd01367015bac68517bf443490eb0e8a5b468aa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and appear to function as a link farm, suggesting a phishing or malware distribution attempt. The presence of external URIs and the nature of the URLs indicate a likely attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pistant.ru/uplcv?utm_term=wolf+777+apk+download PDF link annotation
    • http://wronba.com/uploads/wysiwyg/file/litapavutikukux.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/488488808.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904093831.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/32103966852.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/acb7feaaf418088b2094518143073fa9/gokeweraxol.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mavexi.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/mozopokafexuwes.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tipavoselilenav.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/momukavopizatofogif.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/26535715026.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/kekaseg.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/64639957043.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/47776373285.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/422abcde4232a79f5ce0560896ca1283/86527015121.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/77183105123.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/zejejezipixeb.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/xapum.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/laduvutuj.pdfIn PDF document text
    • http://gaudi.tw/upload/files/sijolaxafotub.pdfIn PDF document text
    • https://highrise.pl/file/40508307058.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/76394870676.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/wipiluwirexagevu.pdfIn PDF document text
    • http://www.polni.si/Images/files/65256675820.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/32919261301.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/91721178093.pdfIn PDF document text
    • http://ausafe.net/images/art/files/97034050341.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/90432886647.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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 10120 bytes
SHA-256: e9abfae0c7685fbfe45754a2db92635dc890ef2a22c3d512b90cac3d1531fc77
font_01_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 17116 bytes
SHA-256: 47c8658abb88d535f2cb815b1098310254350af3727a626e59b9b57c93811df7
font_02_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1