Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2765579ab6e15b2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 06:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d402c75e736f9f101bdb927a2535cb25 SHA-1: 66be88a6c06ba7eb4661463c94b83a50dccbc237 SHA-256: f2765579ab6e15b26950e6071d0dad58ba8dcf75baddd3af6bf6e69bde606c8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the high detection scores point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://yongqingtech.com/d/files/lufefebikutexazibijasuka.pdf In PDF document text
    • http://erulingua.hu/uploads/content_files/files/jalovom.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/60858430783.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/15410527643.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/ziratidepirirusanugawe.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080049326949.pdfIn PDF document text
    • https://kaparatt.com/images/File/3147392536.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/xuxagusokitodon.pdfIn PDF document text
    • http://www.bandungmesin.com/file/51620820166.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109091429084369.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/35515104030.pdfIn PDF document text
    • https://grandegroup.net/files/zakipalolosebenijo.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/sakosejufewavedazasepalen.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/36472264782.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/54850491544.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/xunekefo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/aqr2a9hq6jlq6ns9tbd1a6gu00/56228912493.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/bizadekamulafopagu.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/27621644154.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/ninovetekizabefiwe.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/64721335260.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/bipovuwexopilelewosudaba.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/19757672475.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/51665214391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fix+hard+bricked+phonePDF 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_off0000b3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC06 14792 bytes
SHA-256: e927d285fca5cb08d4b8b7c50c3558d93c414ef3c3a55be977109bcf12327fbf
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 10612 bytes
SHA-256: 40e787b1cee89fd85d103b2d3e12a56f7bee76bccd72f90d99653a306b255edf