Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c43e215a0b920cd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 11:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 0c27f22240f27b3e1c4eeb2df9688824 SHA-1: da62bf04b0652398b158af7bbb5e80d129d660fc SHA-256: 7c43e215a0b920cdb965568899abd7909c6fc987f63e01e6015678177b3433a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.saletime.gr/admin/fckfiles/file/85885815820.pdf In PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/53182430716.pdfIn PDF document text
    • http://teakdeck.pl/files/file/72913838025.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/xonimuwuxonaxa.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/19625931019.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/lotunopav.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/30184948982.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210906025901.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mesezoluburomo.pdfIn PDF document text
    • http://ud2-140.com/files/49026346553.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dakiji.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomor.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210914135114_1054596726.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/zikofaxiragatuj.pdfIn PDF document text
    • http://tvsporedi.si/vsebina/kajukirumemadaragalolel.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/15002659644.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/93588541033.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/54547986208.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/mesepu.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/zanigawukek.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/3253831832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=zepeto+new+version+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_off0000bc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC75 19328 bytes
SHA-256: 0b9444713ecd3c84c348e2c6b94122b1e4172c73ab42fb32345be4dea900e846
font_01_sfnt_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 10404 bytes
SHA-256: a68b885e0b7480a17f8a2f02340baeb95f0dec4dc6815cc846142fd64330a85e
font_02_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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