Malicious PDF — malware analysis report

Static analysis result for SHA-256 9610c6500dd52856…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 08:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4cc27783596f97b2a88b32d180b525f SHA-1: e18db2f23b573c76f680e81e150cdebd7d8a96a0 SHA-256: 9610c6500dd52856c96e98ad696d74b09c2f3fb8c9bff25ee7ddb07036f85e41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a campaign to distribute malicious content or phish users. No scripts were extracted, but the structure and heuristics point to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://jewelry-shopping-city.com/uploads/files/202109031245334852.pdf In PDF document text
    • http://asupuro.com/user_data/image/file/73385738494.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/31320195758.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/49885990938.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/30867873084.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/37687544942.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/74583182895.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/13316989932.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/efaab48e5edfa266c940417c4073e94f/4454914233.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/givunodigusawokedopub.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/lasijivov.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/bulutuvuzata.pdfIn PDF document text
    • http://ruihuitax.com/files/file/27842159258.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/zudifufijedubibefifamu.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/warinexekajuletududi.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/29688525757.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/79194852801.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/nogopolimusibutakumesoxo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/76238199650.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/lulexoluwezobibolajexes.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/xadaroro.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/volezimujupoworabowur.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/79957828747.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/12908973500.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/54950561808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wwe+revolution+gamePDF 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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10528 bytes
SHA-256: 647cdd5dcb804cda9f2659e99430ce3ddde2d24a7e3da3894c01fb320dfd4c45
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 18420 bytes
SHA-256: 0f205818bba64909f30fa89cb6508da0bceafb8af6d0377da6078c26ac02522c