Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d9fb947fde568…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 09:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af9ec7c7aa5d58c57139570b4a38d6d2 SHA-1: b51f5a311b9198df42164ad22deeea2330a8fd54 SHA-256: af5d9fb947fde568b2ab36ea004f74d31b49099e236ae0717c583423c530ec0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.awakohchang.com/image/upload/File/6631892046.pdf In PDF document text
    • http://ebd.su/UFD/7623/files/pixokujowavitimekarapak.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/58084815036.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/molulasisep.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/virateligevubikarato.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/tanakej.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/30644976603.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/44310571206.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/niralibepuvuguvib.pdfIn PDF document text
    • http://chemicalengineers.ie/images/11586054006.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090402435884.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131b72802412---8970824909.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3611944a7aca998695955dbefb21573e/dugiroropamuroseloduwi.pdfIn PDF document text
    • https://grouptm2.com/contents/files/xunagenipide.pdfIn PDF document text
    • http://pasaru.com/upload/files/miwajelodekuvakepebedej.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vifobijatiwukuvul.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/9432186772.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/vizag.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/rezubajekew.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/21035465774.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/jesatanugir.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/90147008480.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/duvojaralegupogozumido.pdfIn PDF document text
    • http://ned.ru/uploads/files/boxumigitasim.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/46301708373.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/tawuwepexexagen.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/44392835310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cartoon+photo+editor+app+for+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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 17812 bytes
SHA-256: e6ca99d8f82d5f6886f305cabc06ad48f4b13d4ec61d8a12e796735abfacc900
font_02_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 10412 bytes
SHA-256: 5d3e6d43d4a42cee04b3b074ebd88ac7489cfc1d49c06a3fbb9c3eafa1ad1b0b