Malicious PDF — malware analysis report

Static analysis result for SHA-256 b001d60009bb890c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 07:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f28689a751fe0da5ccadb5daaf6f8352 SHA-1: d93ec90162fc1b1a4edd2cadd6b622a1bc62280a SHA-256: b001d60009bb890c158295fc9db0f9fd482f204c1b0d618201a5350dd3826b5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a large number of embedded URLs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=games+on+phone+multiplayer PDF link annotation
    • http://dolphinkorea.com/files/files/57351735439.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/daritenapujisufona.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/noboju.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/ritirogikolobijagetifuge.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202108312323125788.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28bf9a8d0---zuwumowedap.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/xipapawenewun.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631295861_1.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/70054276642.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109051417345230.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/89432789976.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/dugadawofesosom.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210905210154.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/81224972616.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/siritane.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/92767623427.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/18716147769.pdfIn PDF document text
    • http://pinxedien.net/upload/files/34366345392.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161352771918e5---2045637133.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/jizifodowoligujale.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/xarejoza.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/41331410639.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://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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 17408 bytes
SHA-256: 8c99f5dc8c22c969dc9319c17bbde1c832a720140531d22762cca982499f9047
font_01_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 10768 bytes
SHA-256: a31a620ebaa77e088a5ff0927cbe9e82b9f2339ef06a45e71806c2e0812d5667
font_02_sfnt_off00012e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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