Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd1f58f4ffa5acb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 07:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15ecdafe731a3cdf05e1b8bf6e3587df SHA-1: 447261f34af14d6808baac4bb157f6154e34ef48 SHA-256: 7dd1f58f4ffa5acb295817647ffa9c12100c064f0d34b30f1b4e9fd7ae843f10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is an SEO manipulation tactic. ClamAV detection as 'Pdf.Phishing.Trojan' indicates malicious intent, likely to distribute further malware or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bephoangdung.vn/uploads/ckfinder/files/sesesik.pdf In PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/66605862125.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109100607029532.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210915160813_1039327561.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/wowezaxedamutefaxe.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/19609123988.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/38581137410.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/serofugufenixigutera.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/84762760581.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/vewudafefoveto.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/4941633080.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/7044932323.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/zolowamarowemuxovu.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/gajelomomixisemanurevige.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/leladigi.pdfIn PDF document text
    • https://aitalk.vn/upload/files/38139934845.pdfIn PDF document text
    • http://precisao.net/files/files/38670530821.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/24140996644.pdfIn PDF document text
    • https://nevisnews.com/userfiles/14776414210.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/tixiranapuwo.pdfIn PDF document text
    • http://banquat.com/userfiles/files/33206438340.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/58124948674.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/232465d0841bf6c8b8d3b6dc714aec8d/xuvalirowenuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bloons+td+5+money+hackPDF 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_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 10836 bytes
SHA-256: ec9bd98a417fa5f7552bd0ddbf181517286168b69210aac3a938169ff749d22d
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16796 bytes
SHA-256: 9529bfd34ff6bda5d9c409ebdacf580df3f7cc16554488825a1bf1ff779bb4c4

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