Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b3bbc6171ffdb6…

MALICIOUS

PDF

80.5 KB Created: 2021-10-07 11:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9e71da10970cc581ce5b4b5d43eb397 SHA-1: ac76794e9e1c65f4466307613799367941ec3ee6 SHA-256: 56b3bbc6171ffdb62d5d80718b4dc4bab2e9b5da2218102cbd3954dd447378c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=save+as+a+pdf+in+word+2007 PDF link annotation
    • https://dcimx.com/files/xejulabubagebegavodeja.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/bafol.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/10a5e78634c5677d014dd0f03fca4ad1/xoxasaxanisip.pdfIn PDF document text
    • http://hainfelderteich.at/wifabamob.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/41135614103.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/nululawurirodafalogabiso.pdfIn PDF document text
    • http://exima.kr/userData/board/file/91244756379.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/49392887032.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/dagefopulesis.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/35413532997.pdfIn PDF document text
    • http://forti.in/userfiles/file/vuvawejejibulapixixe.pdfIn PDF document text
    • https://vitanov.rs/files/87643605463.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/gukekufedasigazisojowo.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/13523219677.pdfIn PDF document text
    • https://mcorretajes.cl/upload/file/duzakufuneranoteve.pdfIn PDF document text
    • http://saaretravel.ee/images/file/72764760192.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/91382195865.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/95507242320.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/muzawinojes.pdfIn PDF document text
    • http://cudicio.it/images/file/lukadexumojubu.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/26692031299.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/10664407969.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/zawato.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145838601807---tojodivurofodexo.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 17224 bytes
SHA-256: 41ce1e4aaef05bd5357716e2240def7fc0394eb9cad0b86d7fc28e62b9e7da7b
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 10868 bytes
SHA-256: 32f620200d1dc934fbacde93193824203858be2045a48ddd442f288eddff05ec

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