Malicious PDF — malware analysis report

Static analysis result for SHA-256 51da02ac6130df65…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 09:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 543a3f0abf2541f79ac9dd6db1a56ca0 SHA-1: dcf41a150aaa445c947d1cddb007c5d0bc93feaf SHA-256: 51da02ac6130df6511df17a214f2f047977876dd764748e78f4ce4959a3e2427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically calls out this behavior. While no scripts were extracted, the sheer volume and nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://capitaloffice.pl/fotki/file/pavubofo.pdf In PDF document text
    • http://montazenabytkupraha.cz/files/file/wedireregudi.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/77440496323.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/141045011009.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210910223312074394cukegz.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/85941679755.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/40813976593.pdfIn PDF document text
    • https://architektor.ru/uploads/file/romowevu.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/22492734260.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/60550337918.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebfbd3933---13130107874.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/zosonomaxadin.pdfIn PDF document text
    • http://schokofontaene.de/idata/litibasibigevudune.pdfIn PDF document text
    • https://laps.pl/userfiles/file/minagijakijixufibinas.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/gekuzelowoximix.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/72423766149.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/viworaxekofo.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/75757189661.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131257581b77---puvoperoxuwotadikomew.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/11699143076.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/17291463584.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/tudimoradusipamuzumetom.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916150159.pdfIn PDF document text
    • http://koutingchina.com/upload/files/mobizojediwiget.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=interior+modern+house+minecraftPDF 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_off0000f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 10744 bytes
SHA-256: f37f7fa46135abfea646c26e7698f9a28775c7504e0ad892a87411ea1cadd5d8
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 18432 bytes
SHA-256: 8542ef0551ea5ba4d27a0486eaf1e9f2192afc68284031f02660492ecb1d4931

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