Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c31610ea1c3a5af…

MALICIOUS

PDF

75.5 KB Created: 2021-04-14 13:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d0d822854b612bf549a2478a9a1ab316 SHA-1: 88278bd65387fa322c7ea17187f1216ed0d52cea SHA-256: 8c31610ea1c3a5af76ff02432778711e326aac72a26067d3bee5cb77b3b20269
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is malicious and has been flagged by ML classifiers and ClamAV. It embeds external URIs, with the primary one being 'https://xajibur.ru/strik?utm_term=how+to+pair+bose+soundbar+to+xfinity+remote', which is presented as a guide to pair a Bose soundbar with an Xfinity remote. This suggests a phishing or scam attempt to direct users to a malicious site. No scripts were extracted, but the presence of embedded URLs and the ML/AV detections strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=how+to+pair+bose+soundbar+to+xfinity+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60402d1cb323e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_606e7fad6b226.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/fexeluneriravuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_601aaa0940f98.pdfIn PDF document text
    • http://pakupuxojopef.getenjoyment.net/67212214310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_6056e047b1108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_6057a03aa912e.pdfIn PDF document text
    • https://cdn.sqhk.co/tategupet/e1hgnps/88048397270.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/jdieOgj/18970195611.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/qhjifgf/50928851532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_6041c080186f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_604ce54c79aac.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/mathematical_physics_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/hahagdy/83278341410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_60163c43d07fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6040350428df4.pdfIn PDF document text
    • https://cdn.sqhk.co/jolekusij/BFjfghT/78382122277.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/pes_anserine_bursitis_exercises.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/dovedapix.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/integral_calculus_formula_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 5516 bytes
SHA-256: 1703227bac1032c0c717a378d4e385410ac337bb1eeb67ca0a7397a084c80908
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 10232 bytes
SHA-256: 314d2a13e37a1d6b2dc22422b9d06a5fafb52cec940512b1bdbc1679dd2028a5

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