Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de0b56e67c6c67b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 18:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a8b4b17aabfd0889ed58c2f597e3880 SHA-1: 0c3871b16053ad4d239bfc76358a9323776d9d1f SHA-256: 9de0b56e67c6c67bb576dafeca3ced069111241888a0c677f11243c11507a90e
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://home-hj.com/up_photo/file/35782578673.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/jomifegejabu.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/22012191211.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/lajixugokoxugizanela.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zipabimuz.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/fedupibojetik.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/kuzibanofokarozorozoxowig.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4f9dc1be5ef6b8a280fa914b4db86581/45259584257.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/69720059222.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/ziderotovif.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/33358462340.pdfIn PDF document text
    • http://4rrecycle.com/files/file/rufixemomoxifofikotapas.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/38707857693.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/bobodinivujixorup.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/rukob.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/gejarokekilosumaxekip.pdfIn PDF document text
    • http://topp.pl/_topp/file/lowijegusaxonosekoze.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/25970151111.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/bipifebajolevomisamexod.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/mozubupufu.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/lekotemufiluf.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/44109743611.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/jamolilopeganelebujusurir.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/basitinagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=super+mario+bros+pc+emulatorPDF 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 16108 bytes
SHA-256: bcf5a2e069e0263570413588d98039d6980a53efe675f8a877d4dbe049875ebb
font_02_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 10748 bytes
SHA-256: 77428a409afb9a734393b0dac1d5e2dbc3e250e10daadc77d70ef8d1f70ed928

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