Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b23c4861c5738f…

MALICIOUS

PDF

79.8 KB Created: 2021-03-01 00:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b7dbe9df3c8f593f294634ac05621afa SHA-1: a419752b0d05984c4dcf7581bdb0b5107a782637 SHA-256: 36b23c4861c5738f1a1f59d34a82149fa3d010afe613726df5df0dfe82fa26af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, a common tactic for SEO-based link farms designed to distribute malware or phish users. ClamAV and ML classifiers strongly indicate maliciousness. The embedded URLs, such as 'https://nipisod.ru/award?keyword=strange+city+names+in+texas', suggest a lure to a malicious site, likely for further exploitation or credential harvesting.

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 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.
  • 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://nipisod.ru/award?keyword=strange+city+names+in+texas PDF link annotation
    • http://kinorio5.xyz/antares_autotune_for_adobe_auditionydg6k.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/manukanavanerajizuwa.pdfIn PDF document text
    • http://chaptejvxz.fun/9392047270vzj1u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_5fd27f77661fc.pdfIn PDF document text
    • http://mandarin-fruit.space/88415257768dq2q8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426551/normal_60204c2f999bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_603c157864872.pdfIn PDF document text
    • http://scm03.ru/fekagapaberebeleocr97.pdfIn PDF document text
    • http://goodnaturak.space/full_form_of_and_pptdzi9q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_600964c45e0b3.pdfIn PDF document text
    • http://good-production11.site/lijuzitezuwekunomunetudeos75.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/nafamaragisek/95352918193.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/vaponereneji.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/45838002805.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/does_leo_appear_in_the_hidden_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/football_predictions_apk.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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 5036 bytes
SHA-256: 3b7ded7188e41c2660b4d1928a9d9e59894932e3074636732a73cadacd857f82
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 10716 bytes
SHA-256: ff2bb8be27e8f39e02c18c34c238bb7db159b3795d323439727ea340cdd011ab
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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