Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4bb5b45a1b5307…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 17:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfcbcc8670fb3f8ac56ae316bc2c008e SHA-1: aab9bffb6ea13bd200e393aeaadcce8fd889f181 SHA-256: 1b4bb5b45a1b53070e2b4fc6b190ebf6d0553b04d84744b139c0a30d4c241abc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ClamAV as a 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xz-brand.com/ckfinder/userfiles/files/rozezasulede.pdf In PDF document text
    • http://www.asiacoservice.com/file/files/45481411368.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/kenut.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/bugaxirejafukurebodob.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/20121159250.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/14325345863.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/zokuvibuwinabapiluti.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/gotoz.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/bofutivatowategak.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/36252379545.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7edbb019---66793446327.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25a800994---38193785573.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/22511406.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/mifoj.pdfIn PDF document text
    • http://chinahongji.com/d/files/gilavutoxelozowopon.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/selamojozugapezune.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/zidegefonukobamubetife.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/62472717573.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109020102046935.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/laruwadozokizutumu.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/7014298921.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/zedukixalaxirijezaxutowom.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/gufomewege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+roms+wii+gamesPDF 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_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10268 bytes
SHA-256: 4dece58ce7549d3b19132c29aa9324159e0868ae83266c18c190c3f8bf813937
font_02_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 17668 bytes
SHA-256: ce81e7f6a8432ebd47ae537aa130e6e3240136c3e00952e0187f52bdf81f8b66

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