Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b787389d4f92bb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 20:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5e0f71a0c3b4db41a015b7b1f99ee33 SHA-1: a17428039f13a58e2714b1887e7c09b17f61bb6c SHA-256: 49b787389d4f92bbe5e99fc53f3507e96646e4a5b1dbc8b1774d524a3b494eaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely leveraging embedded JavaScript or other PDF exploits to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=real+wifi+hacker+apk+free+download PDF link annotation
    • http://ruresept.ru/files/file/68622965347.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0326990001631148878.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/pideza.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/zovijanemetotaro.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/napijitiwezadoj.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/26112179415.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///vuzabuzemabutevu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/52258398476.pdfIn PDF document text
    • http://millecolori.it/images/file/97436500094.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/43731582770.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/duwozadabuteberoz.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/zovazamafejojupopewexuw.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/sokuvesuxafubazabilari.pdfIn PDF document text
    • http://adurucui.com/ckfinder/files/63992081908.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kikaxixenipexes.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163130852457.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/24619770538.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/janotuwasexasebamu.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/9196214245.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/votobo.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/97543992159.pdfIn PDF document text
    • http://93564497.com/userfiles/sufonawezivedirazepuzibe.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/45086727362.pdfIn PDF document text
    • https://lapdonline.org/file/44679188544.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://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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 10672 bytes
SHA-256: f7d5a2bcb93b8c7a24690b57892f49a4724a9e1f06d749b32f83618e2eca92c9
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 17892 bytes
SHA-256: 5db0684b88a54ef364ad39ecc033c7759ef5d6f6fff09d32eab4829edb91de2a
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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