Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4216b9a165cb744…

MALICIOUS

PDF

80.4 KB Created: 2021-09-09 12:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1c312e539e3eb1eb4e666de2692e32b SHA-1: c0283600e6580e4eeca4e29e1c199686b15fa99b SHA-256: b4216b9a165cb744e6fab28e6a5952b37aee860d6c4e68b800400f9387dab525
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URLs, suggesting it acts as a downloader or redirector. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to facilitate the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=how+to+reset+android+phone+after+forgetting+password PDF link annotation
    • http://slavutich-media.ru/userfiles/file/taroxoroxomizelijed.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/13178557071.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/67533830012.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/burijolugulosafap.pdfIn PDF document text
    • http://qdjshg.com/files/file/52657189999.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/mubened.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rabobe.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/julujeger.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090823163143.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/78881038180.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/92895302646.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/28152971528.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5433c900---desugokuduguvazofegafuwex.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90406058724.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/93041923634.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/49230398361.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136d63a6e8eb---29316779607.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/65937348363.pdfIn PDF document text
    • http://qdjshg.com/files/file/ridogogapawojimubud.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/73262688964.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/71495440215.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/44052908209.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210909180557.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/32420802728.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/10262792.pdfIn PDF document text
    • http://halanmilk.com/upload/files/telebawojibojuda.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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 17316 bytes
SHA-256: 63910086b1a06bc34f9ac298d04c39ff848b9a054eb0014159fd41905f330d38
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10808 bytes
SHA-256: efa53e98f1095520bb0ef6089fc8f412dce2a65287ae562c96e01951b2530ee6

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