Malicious PDF — malware analysis report

Static analysis result for SHA-256 4332d5f3bfcd5491…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 20:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bbcf03ec47e32cd04469941637178639 SHA-1: 8b86bfb344df5e024393e3d5fdce1969e5fdbd76 SHA-256: 4332d5f3bfcd54911899902364868a54196fe41c20467ade2efeaec936830af7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high density of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ylwlgwadmin.ylwl.cn/upload/files/75446261797.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/92106929100.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/larafakunefabixan.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/zimejebipipoxafozavenokub.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/35460555890.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xenibefemugotofikefugese.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/12605209277.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/40612395654.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/33344078782.pdfIn PDF document text
    • http://isvpro.com/custom/files/72303089336.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/papogarovowalufon.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75412094441.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/45107875485.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/18763053833.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/pisib.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/19766205674.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/rigevuzevotimonifugugoki.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/mikuziwadalus.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/dibidavelubudugi.pdfIn PDF document text
    • https://atiksigorta.com/files/97568266184.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/tuzudezaw.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/mobesawilujel.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/vomubaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=live+mobile+location+tracker+online+apkPDF 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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 16632 bytes
SHA-256: 5197c803bfaa3835cc5dc542f332e5a1e784d24ae81e0e9634eb729c71e7410f
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11219 10620 bytes
SHA-256: 8a7f538e3e601aa0a33575d0ea645b37c5c9b67c97ed841877b01794bd4517ea

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