Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ddc31c642b8cf2…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 257c9a4f8a8b63cec3414d9195520dd4 SHA-1: 359ffef2908abc9d902aa09e503734ee8d8a9a95 SHA-256: b0ddc31c642b8cf2f0efe4d6081b96e4405946ffdcce55e72a1beddae184334c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and numerous external URLs, including one pointing to a link farm on disposable hosting, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The primary attack vector is likely spearphishing attachment, with the embedded JavaScript serving as the execution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=free+card+number+generator
    • http://ahlhy.com/uploads/file/011750488388.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3be2dcad9e1dec88d5322ec1253e911e/dovesiziboguxiwenadiwi.pdf
    • http://garage-ys.info/js/upload/files/79930218196.pdf
    • http://astorandblack.net/emailer/userfiles/file/44288704736.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/h4fhh5111vsvgo7fao9utoua89/34596564747.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/tedenuj.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/28589885311.pdf
    • http://boldogelet.hu/media/54618745136.pdf
    • http://sake2metustin.com/uploads/files/dumelafamagewujawonit.pdf
    • https://texigo.tw/upfile/files/2021/09/07/84202514446.pdf
    • https://beruanglucu.com/contents/files/sepubenudo.pdf
    • https://e-uchebnici.com/img/file/59350635101.pdf
    • https://alebusph.centralcms.cloud/galeria/files/reluliwudi.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903032837859175.pdf
    • http://veganogle.es/uploads/ckfinder/files/55899635390.pdf
    • https://limsurempat.com/contents/files/28228441588.pdf
    • https://nmcs.ca/userfiles/files/zetitelax.pdf
    • https://ngonluathan.vn/images/ckeditor/files/75418932029.pdf
    • http://ruresept.ru/files/file/68622965347.pdf
    • http://abbwingslynnhaven.com/uploads/files/mosixojit.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210904171304.pdf
    • https://destockbaby.com/ckfinder/userfiles/files/sikojadowasofigu.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/20780524109.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b0.bin
2906dec72a580db7d4fb6aa4857a52d88de71120d6c101d85c1795463ed06cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B0 16760 bytes
font_01_sfnt_off0000ebbe.bin
dce16aa8cff851763e5011ac70b492e733980fafb0d68f7fa75c4c5ebf5e5ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 10624 bytes
font_02_sfnt_off000103c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C8 16792 bytes

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