Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd97c644d89a82e…

MALICIOUS

PDF

68.2 KB Created: 2021-10-04 01:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2fc0f4c4172d04f3bc68f859826cd9fb SHA-1: 78cb25810e79d095df00e366965c4bfd73ae7c6c SHA-256: abd97c644d89a82e0b56bdef2938841d8185a76d25a2f13761e83efdace6dbc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=best+screenwriters+in+bollywood PDF link annotation
    • https://digireg.org/upload/22100925244.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109270706451567.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/97841530663.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161581d5a52216---6542921190.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/lazatak.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/47661484324.pdfIn PDF document text
    • http://belv.ru/userfiles/file/8853704133.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/51775845664.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/fajopegegogitegigu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/mafojekupirobuw.pdfIn PDF document text
    • http://kgmda.com/upload/files/2700667370.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/10742636651.pdfIn PDF document text
    • http://raczcsalad.hu/files/degofewipuzakozilewij.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/famojumikesexag.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/69023910842.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/17550722956.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/12658794153.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/32559178922.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/fujipalesemafofe.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/71413228132.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/soninojij.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/13814448853.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/9737312592.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_off0000ad3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3E 14956 bytes
SHA-256: d7dc76eb67756b634983e4d90d0aa5ac36c3414d336fca8001a1ab940ac9a460
font_01_sfnt_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 10596 bytes
SHA-256: ab6adb91d7745048225d83c67af2ad970caa76878027522ee52a607f07f1cd1b
font_02_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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