Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b5124ef202545d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 01:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0da838f407f25d8cc33119fe6ca0a341 SHA-1: 0386deb1be6dfe70c3b72267cb6bc88326a86c00 SHA-256: f4b5124ef202545d8530ab273c6b5ed71eb26ff79959de7e16858dbe7f25bfc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially malicious or link-farm domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these embedded links. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tutek.eu/userfiles/file/roliwako.pdf In PDF document text
    • https://egf.tw/test2/images/file/77200714626.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/demavisererubokoxusuloda.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e72bd8322---jalijajubonez.pdfIn PDF document text
    • https://rintrans.com/files/mizano.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913023248.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/mugozovewojogazorilodotof.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/kolawukofaxuvud.pdfIn PDF document text
    • http://scro.ru/pic/file/jebijosu.pdfIn PDF document text
    • http://turnyras.lt/Files/file/konebiwamabakipuk.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pizasupivogelojew.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/giveguso.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zugoxigefegixonu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lufevowola.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/4323870743.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/15581303584.pdfIn PDF document text
    • http://air-con.ru/upload/files/balemufoxates.pdfIn PDF document text
    • http://prota.ru/upload/files/47658843149.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/72383408865.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/5006234878.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/vupinodukabodolexide.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/zafavojowetukawavojus.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/vafivinok.pdfIn PDF document text
    • https://peterdegendt.be/file/pifexivemat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+legends+hack+accountPDF 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_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 10876 bytes
SHA-256: 28406db05aed7631965fe9a52ff81286016ed4e1213ed0628bfde0bd82505127
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 19688 bytes
SHA-256: 3c9c565a1503d9d26a547408b8c8550ff18dd16158526b7a59c7780b3be0e816
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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