Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc559affae6b775…

MALICIOUS

PDF

75.4 KB Created: 2021-10-20 22:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 769b718f7d2672dfb8eff74d691af803 SHA-1: 5d5dcc4ef999b7bec9a67b5bad454de503eecb6b SHA-256: 4cc559affae6b77501419771eecb197459a9295d31b6608105b435b1edb7c105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=you+unravel+me+with+a+melody PDF link annotation
    • https://hamzsabegi60szallo.hu/UserFiles/File/suwujanimoropato.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///6593304114.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/mezijus.pdfIn PDF document text
    • https://subded.org/userfiles/file/61519106933.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34107076178.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1616aaf70012b6---60007219522.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/50131546679.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/sibetudumax.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/55293030831.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vibumagogiwezitaw.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/4405617544.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/29513161428.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/rujewajitubetak.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/lenujabifu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/rafijij.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/derusopepokuwixik.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/144229495.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/rakijujamumiduvizifom.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/supowu.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/64072284738.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/99889896412.pdfIn PDF document text
    • http://dnepropress.net/files/file/42551587712.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/lasuwotavogimugepuji.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/59608083626.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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF9 17212 bytes
SHA-256: 6e748e2dca731fbca8012bb0be1e9899ed3f0f5b8ea2f7a83ee3880119fd00b9
font_02_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 10696 bytes
SHA-256: 80f07ac8ed089c2706c68de22d7dd500a7a8438c42a3e16f649166bff1213e95

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