Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7640018173a53e…

MALICIOUS

PDF

98.5 KB Created: 2021-01-22 05:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a22514a8b4d48e01178a80c62f0f83b6 SHA-1: 70809f861fdcd35a88d85f12017502537b3dca36 SHA-256: cd7640018173a53e89cdc7908bfa5338b38614b1f819aca7cebd0c9037a2cb75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=indian+mathematician+information+aryabhatta PDF link annotation
    • https://cdn.sqhk.co/sejujona/c6hfXib/fumixexuxoxeronusavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd6411f5b648.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/jhB5y8x/47409155398.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/agtGggj/wsdot_ferry_schedule_vashon.pdfIn PDF document text
    • http://dulexip.22web.org/38616307175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5fe601f6a865c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd91626b4c67.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/g5wc6hd/69855680196.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/hhieihI/zipavafisa.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fLHlqfh/95215266890.pdfIn PDF document text
    • http://runivofo.iblogger.org/hammerlock_dlc_guide.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
    • http://jopivot.rf.gd/55515884241.pdfIn PDF document text
    • http://jirizaxewusi.epizy.com/detailed_information_synonym.pdfIn PDF document text
    • http://dusetelonuzaj.epizy.com/nebekerofa.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/90903590952.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/pdf_to_word_document_software.pdfIn PDF document text
    • http://pimizebogo.rf.gd/security_information_report_sample.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 5228 bytes
SHA-256: 366dba1eba9359d5ec8568d7cfeaf8254338edd8c3e13895b75a663146d9bf77
font_01_sfnt_off000132d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 12036 bytes
SHA-256: 3554a93fd8d2a006f3541b5b6cc81b6bcbf3f01090cde992652a6b304963ebdf
font_02_sfnt_off000158ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FF 16084 bytes
SHA-256: 249651805b0a8f5b4743f17da7e3943b18be49f9c75a96c0f18a2f62b87e55bb
font_03_sfnt_off00016de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE7 3592 bytes
SHA-256: 4023976196139081c68e8ad56c4b4f65e52d13ea1994db4f63df0807280550ad

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