Malicious PDF — malware analysis report

Static analysis result for SHA-256 67226907c91efc81…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 07:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 562e7d6bcd1748e4d223c82166dc1011 SHA-1: 7222e882ab48b60ef330a44be532db44439fd0ed SHA-256: 67226907c91efc8181696a346b7e57b5fc6056e1973d6f7632f2fce863283929
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions such as downloading secondary payloads or redirecting users to phishing sites. The presence of numerous external URIs, many pointing to potentially compromised or disposable domains, further supports this malicious intent. The ML classifier and ClamAV detection strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 http://grupafurman.pl/!mag2011/userfiles/file/bapikexidupula.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f19e7968eea96e35d4cbdadfd6e4ac28/vopulanujakaromobasarugi.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/dekunodavojafapesefavag.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/nezub.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/46132064750.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/24036628493.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/28889439525.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a70e1c2616---5100743647.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/91743193200.pdfIn PDF document text
    • https://subded.org/userfiles/file/21987634370.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/18629421273.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/pefuzobepubivagux.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/96517693580.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/96288551831.pdfIn PDF document text
    • https://digireg.it/upload/60745786612.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/31019596991.pdfIn PDF document text
    • http://tomdythai.com/userfiles/files/53001883028.pdfIn PDF document text
    • https://egf.tw/test2/images/file/37230768910.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/74147061392.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36179751944.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xixuwanipexusoxidixar.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/76804673187.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fosogajufiko.pdfIn PDF document text
    • http://newshop.jp/archive/file/jasaxek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cheat+mortal+kombat+mobilePDF 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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 18176 bytes
SHA-256: 619940669ae6ba3d7ce27ef92f6a80d0c43722e767788cd30db8b20a461948f3
font_01_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 10364 bytes
SHA-256: 8129a0533f092587fd07fcc4213edf161809b5d537c23f34cf2a0825f0721db3