Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdf6228e1286f0e…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 22:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 27bfaf0501bb90fc27b1af27af5430c6 SHA-1: 7ad3f5aea80b17dd8ea46d4de4aed6b68a4a310f SHA-256: 7fdf6228e1286f0ecdf715e3346eaad638cfc0040f362b1d16b1dc058db86f98
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.8293

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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://golowaki.ru/award?keyword=arabic+language+learning+in+telugu+pdf PDF link annotation
    • https://cdn.sqhk.co/rogudokives/hd4CRjb/robodeniwa.pdfIn PDF document text
    • https://jatisarekitikez.weebly.com/uploads/1/3/4/6/134661612/2a94a82eb065b.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/2xCjdDz/36190077173.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/malewiruwame.pdfIn PDF document text
    • https://wituxilozixataw.weebly.com/uploads/1/3/5/3/135317309/69970d06d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_5fe74bd6a9db5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368223/normal_5fcd5e802a009.pdfIn PDF document text
    • https://cdn.sqhk.co/gixofusofago/ieNllii/mazda_rx_8_buggy_for_sale.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/9885f051fe8c35.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/j8gjkel/nemixavuna.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/vhi8jan/fejesewizerosi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/36572588455.pdfIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_97aaa405261b419db5e7963ce28256b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/cannot_resolve_symbol_appcompatactivity_android_studio.pdfIn PDF document text
    • http://repowibozedo.rf.gd/90048984635.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/confirmation_letter_of_employment_template.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_ccc90d8024b94018ab8eee38b5f42523.pdf?index=trueIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_9c9143bdb6ff47839f4d87167ab58302.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 5044 bytes
SHA-256: e58fec0cb6113d38c0138ab4835206a7541a0ed39aed4954cc19194d8b8c44e9
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 5488 bytes
SHA-256: 3c2e81309ceafa102bfefda6d49e6c2feb82b185e152bf3d829db1887ad52579

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