Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b45b1c24a8e1e9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-30 15:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f72019a761eac91db97365aa9b5ce678 SHA-1: ca28344ee35ab495f6d5f59a5556fd8d8488402f SHA-256: f1b45b1c24a8e1e9de7ea8a75473fe2f2b1e5b3411543af4fd308cfa04fe35c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true destination or distribute various payloads. While no scripts were explicitly extracted, the nature of the heuristics and the presence of many unknown URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://signos.larrialdiak.es/files/galeria/files/vunexosofodimutuvenikoxaz.pdf In PDF document text
    • http://rucodelniza.ru/userfiles/file/931861061.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xazelejesakewuxo.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78503912577.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148b30aca056---zapulerubilu.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/sazivugi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rcq1fh9tvp9k5snvpkpas15nr9/12650873850.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/50876246750.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/bikikomogilizejonewizip.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/53911278333.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/99698379152.pdfIn PDF document text
    • http://elma1.ru/!upload/files/84150391545.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631404049.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210901_25C49E479995245C.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/55102100221.pdfIn PDF document text
    • http://apicn.net/upload/files/lijolade.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/85546965284.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/27745905864.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/pizezaje.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/66779632864.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/jegixilaw.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/bijexaxilafumudu.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/37080312244.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/1425520968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=stuck+on+preparing+ipad+for+restorePDF 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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 11016 bytes
SHA-256: 59f71c48e1ab99b8f70fae6c7d511f0ba77cc4a64283ccfe2da64af68d088254
font_01_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 18648 bytes
SHA-256: ceebaf576cca33749cf80ef0ee90d1340ab67dfd30dd3c7fa36692417e3efd86