Malicious PDF — malware analysis report

Static analysis result for SHA-256 721fbcc7543165c3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 10:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cce1b0bf04513c87b2711ad7081b6283 SHA-1: 5877fcae7f41b47a5aea44e3a80bbf9a89589dfc SHA-256: 721fbcc7543165c33477e3ffe7a7a976dffe9b96a850ebedac72c276c5fab55a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious PDF files hosted on various domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and SE_LOLBIN_RUN_COMMAND heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or scam campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aan.kz/ckfinder/userfiles/files/belim.pdf In PDF document text
    • http://etkindenetim.com/resimler/files/wajutolosalotaduwiwored.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/45558423014.pdfIn PDF document text
    • http://fohow77.ru/upload/file/77558805936.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210901063732_o1muwv.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/34067700878.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/71746640608.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93b66dc1c---9069944119.pdfIn macro / runtime command snippet
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/25250506129.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/74162354262.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109082005173910.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/51302621457.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210909105145801.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/44083609800.pdfIn PDF document text
    • http://snft.ro/media/file/sududifaguka.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/28882927359.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/jamusexosove.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/suwudamubigusogogi.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/85203364606.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/98377699817.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/12123238988.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/zeludosanuxel.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/63863787622.pdfIn PDF document text
    • https://tunhuaduytan.coIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apk+metal+slug+6PDF 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_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10520 bytes
SHA-256: cce6cd888e3d30c4d1a5da99f25a1fccbef50d146a59f50cadb2b710f2c08114
font_02_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 19084 bytes
SHA-256: 074e776cbefb6d100e599487f691af33346327edaa3f24ce045f60643c1f39f1

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