Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba3745514942c3c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 21:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1159c46816fa20dd52c9890f47529767 SHA-1: cc7d8676038703ae9616dd9b11581929bfe264ee SHA-256: 2ba3745514942c3c2c4d75895fe35e19dbd3fbc7a3bcb2e16d59d1df71268221
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=the+great+investor+book+pdf PDF link annotation
    • https://kokomanis.com/contents/files/digapogulozoxetubigal.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/98308792372.pdfIn PDF document text
    • http://katela.net/userData/board/file/beboruvinijogisolabagu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0919fef124364d02426449045ee087c3/65768174023.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/45464470180.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/78947885385.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gikajigosekuvamoda.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/rotakigomokexika.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jerenozuxatenigejexifab.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riximofudi.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/32170838281.pdfIn PDF document text
    • https://fasleh.net/Files/files/99852076441.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/benozibovifomekej.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/fuzifoxunolipevusogow.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/1811482845.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/kuzerozijifadagiv.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/20166259880.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/basis.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/zesekulikogumijewavadexat.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/61417802281.pdfIn PDF document text
    • http://df-2.de/images/daten/file/zudeju.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/11823167141.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902192744651753.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/83516250938.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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 18344 bytes
SHA-256: 2169e8a2785aba41aa8b1c9ccff8e55c891c8ccceb998ee3b030dd502d64cb3f
font_02_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10992 bytes
SHA-256: 8e4608d3894e77189324b9d5feb4b0b303dacb69126be0942a327c796b000d99

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