Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0db06203d477e6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 17:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc9bf8f8311b04622cc9db35a2336a0b SHA-1: 12bf726aa7c70c4908035227ca2fdbaca29e3f1a SHA-256: fd0db06203d477e6b5260a90e14c5925a73f68523484de1de1c3cb02992bfdf6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, which is characteristic of a link farm used to obscure malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_RANDOM_URL_LINK heuristic specifically points to a suspicious PDF hosted on a potentially compromised domain, suggesting it serves as a lure for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dymenahealthcare.com/upload/fckeditor/file/dimepibamixid.pdf In PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/75537480704.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/savagowaravunuro.pdfIn PDF document text
    • https://dafelia.com/files/20858305985.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/betunowosomadix.pdfIn PDF document text
    • http://gibisch.info/files/files/nutomiwibofisuwizojudaga.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/36513392224.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/13417294620.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/44508908959.pdfIn PDF document text
    • http://d-innovation.com/upload/files/11728474819.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/92097221403.pdfIn PDF document text
    • https://wasael.com/userfiles/file/947624967.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/19092237200.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/22495496503.pdfIn PDF document text
    • http://jn-zhsc.com/upload/topuwaxufojebopekobu.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/66981848324.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/pitabepuvogozuwut.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/89190528727.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/32281271897.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/lijukilokiduj.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/kexofepitiji.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/10823169370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=imo+app+free+download+for+laptop+windows+10PDF 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_off0000aef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF3 15364 bytes
SHA-256: 9ebd5d813dd015f0d28d992caeb48a964e0185ec708b6646ba97e7960fe3cbe5
font_01_sfnt_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 10868 bytes
SHA-256: 32d2e49c97519a0c425d1bfa9c2cd32947c52784d11954274dcb858359253fe7
font_02_sfnt_off0000eee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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