Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b275e7624c6df8…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 01:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af01e3b547a0d7797fdbf26bfce47cc2 SHA-1: ce5e87e0f819ae352413dcabfe22ca783ef35959 SHA-256: d1b275e7624c6df81da73267b3f1b3c1a7946c44bce2e64fb9b18c2a9668b239
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://girc.ncue.edu.tw/ckfinder/ckfiles/files/70547040309.pdf In PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/raluditaruxetidakatifi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/36541021993.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/gekofubofitajekefav.pdfIn PDF document text
    • http://seritour.com/rsm/files/14822749482.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/tuvefunixavetikofaw.pdfIn PDF document text
    • http://xtra360.net/campannas/file/3737902067.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zupesesojuwokome.pdfIn PDF document text
    • https://ratoempat.com/contents/files/vamepofidodigiludaxi.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631390675YvpF.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/53556629289.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f22db636921494d3b3adf0b7fe464706/limixo.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jikowumewifu.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/6389727518.pdfIn PDF document text
    • https://majubesar.org/contents/files/29409948763.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/87302804557.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/62194406072.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/32671699442.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jetexuratezasokexetesum.pdfIn PDF document text
    • http://hanifeugur.com/image/files/muboretikodaj.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/98262778484.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/pegopozizebof.pdfIn PDF document text
    • http://upakuika.com/img/file/dinaxodivumuvuniwigu.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/semir.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110918456188.pdfIn PDF document text
    • http://apcmagon.com/userfiles/zomigowomuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+white+tiger+onlinePDF 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_off0000b403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 14812 bytes
SHA-256: 9b22f18aa0cf91f42e7d4635c89e8a6df444c240762c487b5c2b6496083630eb
font_02_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 10104 bytes
SHA-256: 435c73a64717b7a17070d0a1ef33f8d3096c700bc24d74f7971f732684f70acf