Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84d5a18cd84f905…

MALICIOUS

PDF

69.1 KB Created: 2021-09-20 02:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffaa3f24f406036341e73c9c1399d13a SHA-1: b2db17921a56504080db26d5542b34aa1b6c5607 SHA-256: d84d5a18cd84f905dc10343be8e94dfb2daf461540bb0079c9d5a6f4f08268ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous small PDFs on disposable hosting to redirect users, likely to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://coretry.ru/uplcv?utm_term=words+that+start+with+w+to+describe+someone PDF link annotation
    • http://kaiyudachem.com/filespath/files/20210902140906.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/74210463342.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457d08ea741---60350303003.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/depuwezixijo.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/puvugusaguge.pdfIn PDF document text
    • http://toonesk.com/upload/64023820766.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/kubukoj.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fugobikijo.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/31041265207.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/zugor.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/43181068646.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/67125777670.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tifonaratijoletalagolina.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/25426481452.pdfIn PDF document text
    • http://teresachild.com/upload/files/66736240556.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/zasakekenalepuguna.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/52559999496.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/nipikaritanudop.pdfIn PDF document text
    • http://venkateshservices.com/uploads/53510649338.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/97085414726.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/17501044388.pdfIn PDF document text
    • https://nexapos.com/upload/files/nekixesamivigujawajaku.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906053517275018.pdfIn PDF document text
    • https://emenu.hu/editor_up/14744583633.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/wukiwijigilekudegosobefa.pdfIn 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://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_off0000b00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC821 10808 bytes
SHA-256: b5caf85355150691df0abfb2d76a928597da768a6456b079cf0669f5feba5c01
font_02_sfnt_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 14984 bytes
SHA-256: 4b80961508af6695efc1aaaa54d97b27ae28cacb84572ee86b4ea0ea7f784760

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