Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a1a7ccce21b1c8…

MALICIOUS

PDF

89.7 KB Created: 2021-09-18 06:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4ef5a607cd7c6c5269750e1be4ddb88 SHA-1: f5ba1a3e0cb1c8932164b44823ef4e2c670af054 SHA-256: 63a1a7ccce21b1c8df9bd4c99198b5bcce4b39f6d0ccb567ae85d2db297fc923
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • 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+android+clock+and+weather+widget PDF link annotation
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/pifepaz.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/gekisubefut.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/45871177780.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/xakujenij.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d1f3a9ef026a76e144db4da6b93ffe9c/58464671618.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/31102730230.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/lawelokilepadanogameri.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/48425045671.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/duzuvamesirujetujobonopul.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/jabaxipudosazafidirafor.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/25794335832.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/86229655072.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/soburugotubanonizi.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/sawokezifax.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/desitafur.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/90247524513.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/rogadupepalurov.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/piduzuvafowibarugubolelut.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/66723924650.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5c9459c7861d8a310664faf4833717fb/wotujeduzojosijoxoforile.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913111618_NzMxMjgwMTMxODI=.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/56836341118.pdfIn PDF document text
    • https://austarpharma.com/upload/files/44132221034.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_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 18296 bytes
SHA-256: 080b6fd355a00dd975328b3615110374659e36cf5ba2360c122a117aaebf1fdf
font_02_sfnt_off00014099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14099 10880 bytes
SHA-256: 5391e5423e7d895f300fa95f9232abd689cb76bef76938b63e4b3270464fc97f

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