Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb7b404911bf0dc…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 02:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81df77ff94b30daf80b4dd0490070d48 SHA-1: 0b0345082809714dc2e0580e6556d0991a147756 SHA-256: 4cb7b404911bf0dc5063d870ae7a51a10cb95ac6fa45ea53eb07cffef7c14399
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files hosted on a variety of domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://apexsafetyproducts.com/ckfinder/userfiles/files/ravosipurepobik.pdf In PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/zuzamewuzoki.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/91790923826.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/nigowodosenatikobipoga.pdfIn PDF document text
    • http://edallyshop.com/upload/files/popovozexavulorevepijula.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/lekegim.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/73955857582.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/mubetalilekuvo.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/77571330157.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/347014933.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/nikilimoguxesilinowexe.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109060402267463.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/betubeguvutofupuvudini.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/jifirite.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/kojeditamalikuja.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/jevigadobigerubikud.pdfIn PDF document text
    • http://poiskvod.ru/images/file/27245836406.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/niruko.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/fapal.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210911010223.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/boruzowoju.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/gevun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kirby+amazing+mirror+apkPDF 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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 18292 bytes
SHA-256: adec15329882e4e8f28b442be2fc5d8e77557081f5378f200cb74f9934b3954d
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 10548 bytes
SHA-256: f774fe08f8a59dfbbf254feaa9b2b67d8e8b656a87913edba1c03714b30b359b
font_02_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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