Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b2ff5bb324d5e4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 00:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: e9eeb529c826e9d93286144791f0e1db SHA-1: 9aa3fdc5d18cd39579ca3973d962005032ecbe1d SHA-256: 10b2ff5bb324d5e4073b31934050216f2ce2416e9c7114f04aeb9be0281a205e
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://csc-021.com/userfiles/file/20210909053704_a2h6ym.pdf In PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210902_2E1CAF163DD1E4F7.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/riwuga.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/begalupetozawozelowevi.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/45178832643.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/goromisizagoxidatazatu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/82745863393.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/6250868060.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/17184256586.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/88341996037.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613206a1443a0---kuwufilurijekimunafegeza.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/ligurazenapu.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/turuk.pdfIn PDF document text
    • http://arucax.am/user_images/file/gotedimezolazid.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/zexubuwikomofokodijezu.pdfIn PDF document text
    • http://ippon.lv/uploads/File/27050717148.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/givejegonedixuviporelozel.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/80848700326.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/80405206227.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/sezegabikit.pdfIn PDF document text
    • https://okazionche.com/files/tebuwifa.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/74297062705.pdfIn PDF document text
    • http://findusafranchise.com/files/files/nokopegidotofurepoto.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/bulur.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/9749105718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sex+chat+apps+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_off0000e03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03C 18408 bytes
SHA-256: 93d97f3857909beb4e5d644adddbaf6ae77b8d31e428a6f7cb8ecbf402524be6
font_01_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 10280 bytes
SHA-256: 08368af1bb4b1f993cc02ee867302e267ec5dcd410ed9c84eb3411c918d9b060

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