Malicious PDF — malware analysis report

Static analysis result for SHA-256 e463c456c0ab3cc6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 14:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d13ac15976c1c0ff48eddce49278e99 SHA-1: 6258b9997ba0dc56cf82416c9ef2c4f2f3bcbb5b SHA-256: e463c456c0ab3cc689419a6d9edb0a83e1f702d9aead5144c06ba58e80a0fbb8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links, likely for SEO manipulation or to distribute further malicious content. The embedded URLs point to various PDF files hosted on potentially disposable domains, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://thietbiytedaibao.com/media/files/fodamamanimadavijij.pdf In PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55213232726.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/32392658695.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/7421281540.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/vugepujirarajodoluwiga.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zanubokujuw.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d847c26f---jipizi.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/93343692915.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/98025674187.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/89409100119.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zogevutasetatomexirenope.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/54954463604.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/vazezaxol.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/kopew.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/kixuvipapedozuwi.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/5230308963.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/73431920749.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/rujumoxipufifuzaxeboxewax.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3455b1e9---kotafiga.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210905093454.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/sixiwuzexetas.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/sejejoposi.pdfIn PDF document text
    • https://udruga-invalida.hr/files/gozibivosevazekujozetude.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/1272079092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=interface+do+iphone+no+androidPDF 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_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 17412 bytes
SHA-256: f2c5e519464618f0604ca932a4ea0cf8bff7ae7e8c84c8bb71f2df89792373a9
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 10452 bytes
SHA-256: 2e86b358ba579169006ce2eab55591405d2831542a5f123ad80709324a42b78e