Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9544fdd82930881…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 16:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 002058cb58cd4d892d002921c09dd5f0 SHA-1: e926c685299eb2eaa143eee4095643ceb0379243 SHA-256: b9544fdd829308818de93bca02c49ef782d3576573d339e6055981596dd009ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings and numerous embedded URLs suggest a phishing or link-farming attack pattern, aiming to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=best+fitness+apps+for+android+2020 PDF link annotation
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/26674710040.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/82359919878.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/43531698561.pdfIn PDF document text
    • http://lachina.cn/upload/file/sotaworadexi.pdfIn PDF document text
    • https://linardi.ru/files/file/24357072958.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/dorojojepe.pdfIn PDF document text
    • https://megashina24.ru/files/files/73983049491.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/xawumiruvofodopapejige.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/83a3c02f143137c106a918d42d8138f9/2618009510.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/50686472987.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/41370289895.pdfIn PDF document text
    • https://alkoplast.rs/files/puxoritox.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/32463236964.pdfIn PDF document text
    • https://renewone.de/files/zajaxetibagixefodafogari.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/99523729101.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/70818598467.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/xumovawaxibuvixizudet.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/46905807320.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ok3erfmn980boi99rkkdesl0cj/15095121574.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/navepoxu.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/duxerozinebowomujevo.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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 10740 bytes
SHA-256: ffcde66da05404a371c18decff92fffd2f1e847fd0212735c451d7a75d5d0522
font_02_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 17168 bytes
SHA-256: 9ac8eada05a2a18ba3fa98f92405d108dc55b8b17cc8bed6722ee27d69b5fbaa

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