Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9cd792b414a161…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 01:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 39d166682cbcc96521a67514437cc40a SHA-1: 52e22caef42ab73bed3a2e7afd8a3bdbeb62f871 SHA-256: 8a9cd792b414a1612fd794a111ac9a52426b2e762194466c69eb3688221bc4ab
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 0.9912

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://xageunion.com/userfiles/file/basoferapelobil.pdf In PDF document text
    • https://burgas-remonti.com/userfiles/file/93724988839.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/89483371585.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jubokiwesaso.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zuforatozukovub.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/70113614530.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jivisopegidosifimegasasu.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/78196541002.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/bisigipuj.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132370a39169---58743945989.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3012a9ad1d1502f9c719f20f9808aaf9/6565025354.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902074711.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/81309178460.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/869622570.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/didixejutitegevulinejexu.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/20322409282.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/lezafunowaziwu.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/wiraf.pdfIn PDF document text
    • http://calisnt.com/uploads/files/58926727654.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/33180900310.pdfIn PDF document text
    • https://teamcode.net/upload/files/47662031001.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/99866867845.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/31511159077.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/30720715580.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/pivozonupowid.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/laxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=san+francisco+font+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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 18072 bytes
SHA-256: 7d89a08026ef080686260427f3842710be9dc2dca7a927a7738beba0acc8594c
font_01_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9F 10464 bytes
SHA-256: ffe0b7a3a345e98d31905628e48ee1665e4d158ef2c601dbb9f406432ace74a2

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