Malicious PDF — malware analysis report

Static analysis result for SHA-256 219765aeff79d0a5…

MALICIOUS

PDF

71.5 KB Created: 2021-10-03 02:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0828d70d80c071c72beb227d38717f76 SHA-1: 624d0d2a8ad9baf38fe8a65c102c2adffc97263d SHA-256: 219765aeff79d0a550281daabea74b6fc0892f1e43d362f4abdb90fae698014e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://dusunceokulu.net/resimler/files/9319645015.pdf In PDF document text
    • https://barcelona-health.com/files/galeria/files/kadorutupogexoj.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mofibenuti.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/dogon.pdfIn PDF document text
    • https://fultoys.com/userfiles/wumolasimuzizebilosatopi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090406435373499.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/wisebativewamoreleruvaj.pdfIn PDF document text
    • http://agro-partner.com/Image/files/38864327925.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/3214025330.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914021236348619.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/88291590270.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/13747867923.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/xeribefinilefuw.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/gutabusorosak.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/91554408313.pdfIn PDF document text
    • http://yingtailong.com/upload/file/211003051552492885l19uy0ulabgz.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/73140601012.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e939c497a4---86880608886.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/92d630151de39176641e7504be679576/67244535369.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/30093578933.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/23963632568.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/xuvalofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=flying+trainer+ironforgePDF 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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 18600 bytes
SHA-256: 46a9a80d6255859692bd443c8ed8b01c780e235e8646d9d34599f387906315cd
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 10312 bytes
SHA-256: 8cfdfb3cdc465dabefc30e16da1fca4624175e07ec4bb21abe09ba4698b8ef59

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