Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcd20d6196c3f54…

MALICIOUS

PDF

73.9 KB Created: 2021-02-23 18:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5c8dc416d3ab48bef0f691971554297 SHA-1: 73d0d144765b6b2a4ceb58c0816f9aba22f3056a SHA-256: abcd20d6196c3f54587577b6f3f9c1db893995cf5327968e867eb7e74d2f89fb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=best+mackie+mixer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5fffedfa9113d.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/sotafakepexenavel.pdfIn PDF document text
    • http://pegiwikepideke.iblogger.org/vejimiwonijipipunizuna.pdfIn PDF document text
    • http://wasakamow.22web.org/77935590579.pdfIn PDF document text
    • http://getakabawi.22web.org/rocketfish_rf-whtib_troubleshooting.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5fd84d52d4dbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493589/normal_5fecf8719fc77.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/jojuvuvekex.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/8a2f3a7dd50873.pdfIn PDF document text
    • http://walapapu.iblogger.org/55201358569.pdfIn PDF document text
    • http://indital.space/how_to_get_filthy_rich_in_rising_asia_essayj7ld3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_5fe39993a9b22.pdfIn PDF document text
    • http://popularchoice.space/juzoboraxakubi1kaa5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vutame/jikipixudizuzupuzeberar.pdfIn PDF document text
    • http://vipewonenelo.epizy.com/que_es_la_arquitectura_social.pdfIn PDF document text
    • http://validexa.epizy.com/6083232540.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/abc_matching_sheets.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 4664 bytes
SHA-256: 6d55fd78ab05c4dbf80bfddd0b7ad0e3decdf89ea9dde98ace0b70cd5214e484
font_01_sfnt_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 10700 bytes
SHA-256: 1ac169af3589582e1f2427cfc81b4f5adc2c303e589357baf58520a46d37c735
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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