Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07ad31af02147e5…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 23:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 73051b933ff20cb22aa950eaf297b926 SHA-1: 3a490e34a87b30b096c11c8f9e9c7557bccb032c SHA-256: b07ad31af02147e5990989c1171e587e7849fa881cd9cc9b105b2f4ebe87a170
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external PDFs hosted on various domains, many of which appear to be disposable or low-reputation. The heuristic PDF_RANDOM_URL_LINK specifically points to a suspicious PDF URL, indicating a likely attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its immediate purpose, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 https://xuantruongtech.com/images/ckeditor/files/49106253490.pdf In PDF document text
    • http://malir-naterac.info/UserFiles/File/69659319641.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/1272085167.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/96712465413.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sisivivikotuxete.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/77066032328.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vigonakizeda.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210907050901.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/98394319656.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/1784868189613e090189bdd.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/18075971198.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eff52ee302---94092353854.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/vukirujavaxik.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rakesikibesigaranoxejuku.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/jopuraxiner.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/71749883061.pdfIn PDF document text
    • http://pasaru.com/upload/files/disog.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/26832850057.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/pifevokasideroxibenex.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/18588619741.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/bewuku.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/zuverudawosu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/folalewi.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/79692613452.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409c6de2e2c---55865263818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=breaking+dawn+part+1+extended+edition+watch+onlinePDF 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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 11012 bytes
SHA-256: 84c390d38923a7ce59967f27ec839b81938641d1721a8640a95df7505c626f38
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 18324 bytes
SHA-256: a5c2ad7c83cabd51286a2ea041ed33bc47399d45f64415fa52472362a00c18b1