Malicious PDF — malware analysis report

Static analysis result for SHA-256 363ed2b8fb77a321…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 20:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b7f0d5ee0cc4b9491a13126a2e39783 SHA-1: 069fff5946cf4312f65a971368bf96c04ba6a638 SHA-256: 363ed2b8fb77a321cc03368afbbafd6e15fcf1b0367bd4a0ffe73b29e15d2c32
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to algorithmically generated URLs on disposable or potentially compromised domains. Heuristics indicate this PDF is a link farm designed to redirect users to other malicious documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://uhorder.com/upload/files/zudigivoromukupalozoxama.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/gononuk.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/19896344676.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/50299104276.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/lilejuvununefuwipit.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/79227929748.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/lutetubanatof.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/sipafefatebutaduwu.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/3905379273.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/bexikejubovuwab.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/zedakagadisepejig.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/93419379132.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/351d473becd0fea9b048acc8296321f0/63914518545.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/zosipurozajolisabuwe.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/37295066402.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jodesumegaguxubapovixagu.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/nezuriresefes.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/kepofifafi.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/62695697220.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161339781405d3---bikabuwedakabis.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/tunime.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/52956181965.pdfIn PDF document text
    • http://mdtrend.hu/files/file/58572471792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=popcorn+android+appPDF 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_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 19784 bytes
SHA-256: 8ffdd46a27c5dec98c6d12236abe7cefa4e8ea72d214938c25c709abcde96279
font_02_sfnt_off00011598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 10064 bytes
SHA-256: 13097d143efb919294bc1e70c2fb3ba3792866504cfbd9973531978bc0b99672