Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7eb778f2932bc5f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 20:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50b9c60bfa74e431c83d50bb3cc50510 SHA-1: a822f3985ccf898735f1166c6dfb9c089f1429e9 SHA-256: a7eb778f2932bc5f427ca9924a0d54df49efd4e7e9b54aa93f7a816c9df23682
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mldom.xyz/web/img/podborky/files/weviburuditumukaxirixina.pdf In PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/nokevojujavezu.pdfIn PDF document text
    • https://partetesal.ir/data/file/sosadojurajudibuta.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/lovabalixefuderebirok.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff52f6de48---zegibiduwavotisino.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/tebiwolujopapeg.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/tafojatasitejabegogupe.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/kaferisar.pdfIn PDF document text
    • http://candientuvibra.com/images/file/soxoredelokusilitira.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/vesitojipepibufiribar.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/75025251141.pdfIn PDF document text
    • https://ratodua.com/contents/files/64338033685.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/zujowaresuviku.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/54369698420.pdfIn PDF document text
    • https://magerp.org/upload/files/vetigiti.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/42266374613.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55629729314.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/bekos.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/xipajub.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/rimirupolodovetotozexema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+tonight+show+with+jay+leno+full+episodes+onlinePDF link annotation
    • http://dbpedia.orgIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 17700 bytes
SHA-256: 371c74fa8c9c71f93b13fe412aaf424b882cb9b4636a82e337c1a4ac5eb38086
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 11072 bytes
SHA-256: f75c986aa890ed970386097f15dbdc6ce30c45ab936137f570e1077d143e0569
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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