Malicious PDF — malware analysis report

Static analysis result for SHA-256 630cc01dbea8c464…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 23:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc06636f74a078fd1e3499b72f1e19b1 SHA-1: 7ff71ec47cedb898b6f6d405893e9bcdd5664b27 SHA-256: 630cc01dbea8c464f83e4066a11f4af42c589a9db5d8ec721d95f7f7231863b1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous embedded URLs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with few links per host, a common tactic for evading detection and distributing malicious content. The ML classifier also strongly indicated maliciousness.

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://nomylo.ru/uplcv?utm_term=send+email+using+jquery+and+html
    • http://monarchiaerembolt.hu/tmp/19513405977.pdf
    • https://anup.bo/images/files/rejanubikiraruzula.pdf
    • https://bachson.net/upload/file/50492202196.pdf
    • http://aktasmatbaacilik.com/resimlerfiles/29933087387.pdf
    • http://kleinschaden.expert/userfiles/file/11219800922.pdf
    • http://reicar.dk/userfiles/file/bomuxetegotew.pdf
    • http://sapientgenerator.ru/files/userfiles/files/lidenefuwijusunowobuvamo.pdf
    • http://leeclinic.kr/userData/board/file/pepimibimagane.pdf
    • http://toonesk.com/upload/dopujadabejala.pdf
    • http://alarm.pl/userfiles/file/23367621999.pdf
    • https://bostoncake888.com/UserFiles/files/3842769098.pdf
    • https://clubon.top/uploads/files/60807341406.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e1a9b547ab80151a5ab00fc152cf86a9/40998147097.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/71982179323.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/8084933137.pdf
    • http://schokoladenfontaene.de/idata/78866197347.pdf
    • https://holocaustresearch.pl/nowy/photo/file/24095260623.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bojarajipenirod.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df27eee517---67133609499.pdf
    • http://hiniceshine.com/upload/fewetajadamezuzuvili.pdf
    • http://aloisiquadri.it/userfiles/files/19480402429.pdf
    • https://sfeerweter.nl/userfiles/files/35331037225.pdf
    • http://szzxwx.com/Upload/Upload/file/2021911171235402.pdf
    • https://factorysales.com/userfiles/files/97350281487.pdf
    • https://hideab.se/tc/Mediagalleri/file/suvesemetabofutexaseg.pdf
    • https://sbsoftware.ro/admin/userfiles/file/zavolif.pdf
    • https://jung-yeunjang.ch/userfiles/file/diwudidavuvu.pdf
    • http://smartvoicecom.com/userfiles/pojimu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdec.bin
1cfee6fa0c0222a1d129a5e4d93326632e0de091b1f70999a8e49df8d4db5f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEC 11140 bytes
font_01_sfnt_off0000d72e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 16792 bytes
font_02_sfnt_off0000ef40.bin
5da6b91aea6c7304706833824b94c29444f1d705142280031adbb617b3ab90d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16748 bytes

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