Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca277146fc8b37eb…

MALICIOUS

PDF

109.6 KB Created: 2021-09-11 16:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e7c903ee398c940fc45ed5e7ad3629af SHA-1: cf34ec59090eec171d8c36cf1faca3fa6073e70b SHA-256: ca277146fc8b37eb282e4156ab07f3cf3bc42e7004ef69ad8f585202c9881577
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ansatrans.ru/admin/ckfinder/userfiles/files/99044375009.pdf In PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/6408368594.pdfIn PDF document text
    • http://hotechike.com/files/files/42668649188.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50264e3d5---rixonediweruvi.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/katotodasifi.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/30275392487.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/40258839446.pdfIn PDF document text
    • http://rjt1.org/upload/files/3797718175.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/39068673000.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/dowelizazowoxifewa.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/13260851280.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fexuvojekutejad.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161302c2aaea9e---zagawajud.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/letawupu.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/26181860938.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/90336819800.pdfIn PDF document text
    • https://eternalbliss.net/file/sejudabug.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/duratodisimolarino.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/44084785859.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/36764739364.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/4091512544.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/18144016884.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/sawinebe.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/vosaxagisobaruvanagubine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=physics+for+scientists+and+engineers+7th+edition+solution+manual+pdfPDF 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_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C28 11332 bytes
SHA-256: a42622e72c85d9ba31d8a1baaf8c85b7788b37a74c8bc7d990f7953e650471fd
font_02_sfnt_off00017681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17681 18752 bytes
SHA-256: a7c90cd11d05f1833fe839fc1542194702706f84247f0f1e70c0a21e1729ba77