Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbf27e58d38cfd7…

MALICIOUS

PDF

80.3 KB Created: 2021-10-11 09:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ccee3328a5431acf88d6495f3ef77a36 SHA-1: 3fcb18e0c0e904af8536662209f61fb7ba7f881e SHA-256: 6bbf27e58d38cfd7f8d59ee90614c9f33624821a4209c823c9ca8ee3fa17865e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are on disposable or link-farm-like domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thefencedocumentary.com/adminfiles/file/tiraxeguvukonirujopufep.pdf In PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/fukunosakaredomof.pdfIn PDF document text
    • https://izometal.net/mm/file/44612074862.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/tunefoluza.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/48933451737.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fb7e3ec199054669981335adc0826f07/43289447166.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614148724f82b---zubavixipidu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/47125482977.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/lixopiraferasuwo.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/40635412360.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/68423227989.pdfIn PDF document text
    • https://mentormedya.com/files/32550689018.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/lesawi.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/71114803304.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/49543953724.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/85893177486.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/74694861939.pdfIn PDF document text
    • http://e-district.org/userfiles/file/35454035720.pdfIn PDF document text
    • http://petrduchek.com/files/59014034178.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/34636264642.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/jifazelodazaxupuxevubewe.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/momebojirebakugoxuwa.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/87536768154.pdfIn PDF document text
    • http://qdcmd.com/data/files/tuvodagojumedowifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=english+sample+paper+class+11+2020+cbse+with+solution+pdfPDF 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_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 16664 bytes
SHA-256: 22257f56bcc3f3129b0dbc567f1803797114d509760bb585ba583b737b9ec477
font_01_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 11668 bytes
SHA-256: ad646cfef6c05f547fac0e91ae0f8ea4cfcf2cf385ca561ca6a9cdacbe332a6b
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1