Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3596ebb1ae57474…

MALICIOUS

PDF

88.3 KB Created: 2021-09-17 23:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 22a9aa6125a5485bb7969a2912a01b67 SHA-1: e5e4047c0a08e0dfeb60703982a8d6bc46febbf9 SHA-256: d3596ebb1ae57474b22d3d6e879c43e063a584d1a08189291078602e6e64ba65
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to direct users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cimkezes.hu/uploads/ckfinder/userfiles/files/77019611382.pdf In PDF document text
    • http://blccy.com/userfiles/files/5812553995.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9700ee373---povakefalubosuveli.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/jexuniwurijilabiwedetori.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/24957959055.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/14914206691.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/74326722705.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/lukosowikovekolulixegolun.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/89184351724.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/dubaxukiwurukote.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/mokose.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/vifokidimejewegojodovo.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/17719402774.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/25950662050.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/lupoju.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/11192386622.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/32847381909.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091215571310.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/3495636993.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/q0lathed78ejt3vs6d3gka36et/budukulexu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/pafilurodizudirog.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/81432838262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+use+old+phone+camera+as+webcamPDF 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_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 11004 bytes
SHA-256: 836c54faad762547ba122f688de55db42eae11895872abd8feb43fdb1f62ddcc
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 18448 bytes
SHA-256: 0f300c2bebc2c8140c5be517f27f179a9ba0d7948547954d1860581a564d265b

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