Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4eb25db3abe200…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 16:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f834f50b3a9494d3c2317961df80af0b SHA-1: 6b9da04b525ece9c111bb659ed6d292f2e3c8187 SHA-256: 5f4eb25db3abe20039e40b75f2888e0071fa5f312460a430622d9c206ae4cc80
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains multiple embedded URLs, including one pointing to 'infrive.ru' with a query parameter suggesting an Office 365 admin login lure. The presence of 'PowerShell' in the document text, along with the callback phishing lure heuristic, suggests an attempt to trick the user into executing commands or calling a malicious number. The file's structure and numerous links to disposable hosting further support a malicious intent, likely to redirect users to phishing sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://infrive.ru/uplcv?utm_term=office+365+admin+login+as+user PDF link annotation
    • http://tahi.hu/ckfinder/userfiles/files/dunesolibo.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/gufux.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/98689429649.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2tjbino0tlspqiqt4jehv2j1l8/76329453279.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/sadetu.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/71783214367.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/2629974462.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/vexuvezabefakites.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/13022982231.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/25907046426.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/80339665896.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/25275141063.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/zabizin.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/27231400477.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/degoxiwexejejirodapid.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/rakosusitidukemupunubinof.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/42647519700.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/xumelilevigimomoxo.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/75604233296.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/7936261849.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kewakipejes.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/jukesavexadukiri.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/32297362237.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_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 11320 bytes
SHA-256: c0ac6cd5bef8f0334a4b59be364d01ec5d23267f7ab599cd7efe60ef69cac4f3
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 18240 bytes
SHA-256: 1e2d09d05829bc846b30ed962b678473a0834111378a99efdc1eecbd00d5926c
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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