Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2a25e950c1ea78…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 15:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 208b94931c210c414063bc6c4d5a8e43 SHA-1: b8933c6b32ce5dca20214887b7723584a167cc80 SHA-256: 7d2a25e950c1ea781bca990e6479f2f30c7dd55cd7ed169ac4e0e30c2f7800bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing campaign. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://drafthe.ru/uplcv?utm_term=watch+movies+online+dubbed+archive PDF link annotation
    • http://chenruichem.com/upload/files/ziforugefi.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420eac097dd---vesopupuv.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/xoviberedegugofiko.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/30108938000.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/39877139259.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/97033493752.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jesosejim.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/xazejebevinuwudejususajil.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/6093696869.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60053093001.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nujurovi.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/75897244626.pdfIn PDF document text
    • https://tessuno.com/upload/files/61377b81dd6c7.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/77642929144.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/52289707925.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/99268039142.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210907050158.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/43518157093.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/24871678023.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/3449250673.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/99721880984.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/85927562866.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_off0000c438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 17464 bytes
SHA-256: 841846db22f0a8e7e78237fb74e4bfc1e20bb494988386ef9529fc3194190643
font_02_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10932 bytes
SHA-256: 97e6f8540e200c216601ce13d2751f0061260b0dd63e73258604dc71c9625396

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