Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba058b5c841a027…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 15:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbb2ba594463fd4e2de7d874c5a50dce SHA-1: 1cb80f9878a8d74af328264a0c602a36f93a2492 SHA-256: dba058b5c841a027a2676f9f9a4d8885c1f950898fa2df530c3b29266f84c425
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of 'utm_term=likulator+instagram+hack+apk' in one URL hints at a lure for social media account compromise. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ringid.vn/ckfinder/userfiles/files/90087724563.pdf In PDF document text
    • https://znalac.com/userfiles/file/3230119878.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/rimilarafiximirorujiri.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091002152062.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/jakizanuja.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/20884963402.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/nazagavaputumobazuz.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lelazujapipitupexozato.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/kowudofiwixawikenov.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/pasopoxusa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5a17d42---xeguf.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/rinurosalonerukami.pdfIn PDF document text
    • https://clickbox.ro/images/file/xigovewezideribuves.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/fipevitemexibisuketotuneb.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/kobobotun.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dogiwod.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/90604653216.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/20330613732.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613122cd0979f---wisupalaripete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=likulator+instagram+hack+apkPDF link annotation
    • 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_off0000d7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 17876 bytes
SHA-256: 5b4c276baee05337d0b7c17cd824ff16895a25898f40b3c5111d18ba46795e9f
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 10840 bytes
SHA-256: a69b6ea8a08b557181cc89f1790b37222af09114eff7cf3060b0c214bbd502f0

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