Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fd5331a4a1ca1c…

MALICIOUS

PDF

83.3 KB Created: 2021-03-27 20:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 550c0a35ca179a1f930b94cb4104811e SHA-1: c35433d265dc4f42edd7e00baa614a712d8c034c SHA-256: 65fd5331a4a1ca1c90b66acbfc522e9db36d282da5fa5ae800e45a3b1a1c46fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites for phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=blackout+poetry+lesson+plan+pdf PDF link annotation
    • http://padlamadla.site/nefolufiwapofonagj6g2.pdfIn PDF document text
    • http://decideyouself.fun/97859689807higs7.pdfIn PDF document text
    • http://astropsychology.website/65919963693thpi9.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/gephbjf/can_you_sync_icloud_calendar_with_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_604a8b1269b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6014967d0dc73.pdfIn PDF document text
    • http://requiremcgood.com/calendario_milan_2018_191crmp.pdfIn PDF document text
    • http://hookup754.fun/jasawudurugecj0gi.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/qiegjgg/pefiwemujejidipovivamidu.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/jbgjljd/survivalcraft_2_download_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_601cd30c839b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_5fff2639b4aa4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_d0a168614a5040729d84171e87910eb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mipizaju/majol.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_e4de1165806341f6aafbc4539d9f94cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lanubili/fifiseduzarofemizixes.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_f8847e90f76241299c6676e4e4f58885.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_54b1470b3daa4b3d8ae3eb6b73347879.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/can_you_use_vrchat_on_oculus_quest.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 5200 bytes
SHA-256: b1c4116c2f2ff74b8b04a71b46b3daec0411e51fe92b20044c592a0b6184c553
font_01_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 11084 bytes
SHA-256: e182428dd755c8f975846e4c58101190eb71d0085c6a2f3ce355ee7ab93db109
font_02_sfnt_off00013030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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