Malicious PDF — malware analysis report

Static analysis result for SHA-256 771000a080786b89…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 12:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fb632407ab6f8cf6e21d0597413984d SHA-1: 894e692dc1058deaf81101ae83052107174d68ac SHA-256: 771000a080786b892d89f9bc121694ea19abd94cb8a9e5b43ce3f0f54a2ca9f5
126 Risk Score

Malware Insights

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

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URIs were extracted, pointing to suspicious domains, suggesting the document's primary purpose is to redirect users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

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 https://allytemp.ru/uplcv?utm_term=mozart+first+composition PDF link annotation
    • https://botroul.be/uploads/71789196960.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/462888066.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/gukejifuva.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/3194721781.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/dodab.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4393e15d27073dd2ffd3938a0744da88/gubilurodibi.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/30293912975.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/96373920211.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/1584661573.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/koluvira.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/47566037293.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/vuwoju.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/50462299464.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sotugupovumimi.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/tagosexoxulodotatinoriv.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/87310322545.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/92588757062.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/pufapanavidiminafeti.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/rudakunobejusi.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/78174066676.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/enrjmrhg8dkegocf4gj0mdu4f5/lebadijamiwuzuvepozowo.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/gagonunapadawulowugivu.pdfIn PDF document text
    • http://livestocktool.com/d/files/wujokegirodu.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/39586050469.pdfIn PDF document text
    • 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_off0000b0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 10516 bytes
SHA-256: 48d371a30290e96bed7ffac28604ff0fadf25ca6589b3aecab957d5669ee5ee8
font_01_sfnt_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 16292 bytes
SHA-256: b60bbf99f30898206f0b05b418c7a980782df444997589b3f6a39eb08de9b992
font_02_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1