Malicious PDF — malware analysis report

Static analysis result for SHA-256 85afe5db44037656…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 13:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3643c682170b79628de862fe545fda49 SHA-1: b08490eb9e6cd6823a07a33b0527fb74a0a661d3 SHA-256: 85afe5db44037656a1e4fc97b65a692c0fc7c84e5a2673fdbc0d3411b2eea17e
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 0.9968

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://habibitours.net/ckfinder/userfiles/files/76459100521.pdf In PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/40882024124.pdfIn PDF document text
    • https://podimercrm.com/img/files/79473439463.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/94370672222.pdfIn PDF document text
    • https://servicepapik.ro/files/36232289645.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dijixudibimezaxakitogaled.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/sibofakefexaxuk.pdfIn PDF document text
    • http://gzwep.com/img/file/20219195356.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09d928d43---dararixofozoragetaxek.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/puzujotivazopusipuboxet.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/fubamojudijetifunolug.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/rinatonifawomabaweb.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/38619351242.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/sudezixuw.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/69654531259.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/52890663148.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/kazedusaxoxokaro.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/19684144154.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/binunaxavaxub.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050928381265.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/wimigeparaxurigep.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/65176445106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=caracol+africano+en+colombia+pdfPDF 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_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10688 bytes
SHA-256: de67f47b95cf23d830b67941bf53313343b3635fe44f9cad0808efb1ebc01249
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 19436 bytes
SHA-256: 7280431c996f429b1d1328069fb2bd44544daaec646f086a893739f0e2c26110

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