Malicious PDF — malware analysis report

Static analysis result for SHA-256 96753b26e5a67a1b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-10 03:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2865d3b82110381c68d4ab0348b89041 SHA-1: a2d82007c601c67dbeb0d8e40baa6916fa6c5d34 SHA-256: 96753b26e5a67a1b5c39a1febdf93354055aa48ca93f02a0426cbc997bc9dc07
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs and the heuristic findings of a link farm suggest the primary goal is to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/aws?utm_term=join+pak+navy+civilian+jobs+2020+batch+2021-a PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc7ca5027272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6035dd175abd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fcf0afdded73.pdfIn PDF document text
    • https://rozonamofo.weebly.com/uploads/1/3/4/7/134751518/vofiziwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_603914af29de2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_602643ddabb28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_6036d049d41e9.pdfIn PDF document text
    • http://afterdealer.pro/probability_formulas_class_10ds9t5.pdfIn PDF document text
    • http://shop50off.info/neram_album_song_free_masstamilan486qh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fd949c315037.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/wogifekijilakon.pdfIn PDF document text
    • http://yourdesk.website/elements_and_principles_of_art_powerpoint_presentationa1894.pdfIn PDF document text
    • https://cdn.sqhk.co/wowasuperan/TgiKhgj/bufferedoutputstream_android_example.pdfIn PDF document text
    • http://getsalle.xyz/15901551429an9ju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5fe7df3f50f6f.pdfIn PDF document text
    • https://fimiximokizo.weebly.com/uploads/1/3/1/3/131384127/podubowitu-dowimijuju-kudajazip.pdfIn PDF document text
    • https://cdn.sqhk.co/dopinaku/OWgcpHD/directv_package_channel_list_2020.pdfIn PDF document text
    • https://vomukefepa.weebly.com/uploads/1/3/1/8/131872153/3416075.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_2944407dc62749e49244bc6dd07ae428.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_3ab19798b7a549e6b2af745e61ff0308.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_0cb5860a98114fb987f8e2fd05c8b822.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_f93328c0cd1d4131881a9f6b8919938b.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 5712 bytes
SHA-256: b60170d6958793f1dd6da1015fd0f0a1583708e58fcf548df1b606c07dd77d82
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10892 bytes
SHA-256: e0b2da0c429622b6a141c42b23b77e25f9b614605d20891f8ea89b3a3b32331d