Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f6c9c2d0d89827…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 16:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6b67f4acfcb7a6aa1a4eab2fca17dc1 SHA-1: c40747cfe198256f2ac252e4660cd08a57e960eb SHA-256: e1f6c9c2d0d898278a3e56fd69e7c04aaaee17b3fa212b046c469b5b9fd622f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to disposable domains, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware distribution. No scripts were extracted from this sample.

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://dierenwinkelindex.nl/images/uploads/87583573965.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613926dfb03d0---sitebotupezawoweriza.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/73577062548.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/sodapokinumabilupumavesat.pdfIn PDF document text
    • https://sitarasign.ir/data/file/kelawegaladidedaloxizesi.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jexaguwabuwewukuro.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e46c2381c---wogotiwekedib.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/30873164596.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/23506508190.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/98721386266.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/zagipiganokuzijo.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/55160254756.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/vedamogejiwefogoregolo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/87177430903.pdfIn PDF document text
    • http://cityfate.com/files/files/18897521470.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/denajudu.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/72409541138.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/xikoronow.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/2841726293.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210911005616.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/43347105763.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6150c0a19cc3c.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/piruno.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tiwarapufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+scan+a+pdf+document+into+wordPDF 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_off0000b1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DF 16576 bytes
SHA-256: 15cb10e058ccf11de23b13f1a2366a6971b5d7634b06e12613b96437bd3bd1ab
font_01_sfnt_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 10912 bytes
SHA-256: 5fc779ceaf51f49d1a915edb669b226b11f1848f51f1adf389e8637342e57fcb
font_02_sfnt_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1