Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d75f7d0149394db…

MALICIOUS

PDF

82.9 KB Created: 2021-10-04 12:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7a0ee8675626918d094d652b07dd4854 SHA-1: 441480a0bb8bde461760860bdaf7eddfbe9dc7ba SHA-256: 4d75f7d0149394db119554a5e11b223ce3121d49e8d6a04439319c0fe22c8c75
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. ML and ClamAV detections strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a malicious campaign aimed at tricking users into downloading further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tourgrodno.by/images/content/file/fafaperozisemasami.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/32464787673.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/verisomoku.pdfIn PDF document text
    • https://rinducm1.com/contents/files/wevukilidapabup.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/pijirozuzonudumi.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/bajinevipimufulikopus.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210912212607.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///tenokirunafowedomuzefak.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/jarinudajolosejuweti.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109040527399999.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae2a4be55b---92195944425.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/zowukizawiseroderobomazot.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/bujefekeselefaxedawale.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/57200096684.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/84676264499.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210914141421.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/45341441555.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109230916131749.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/83905052466.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/99698171234.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/72510205610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pharmaceutical+wholesale+business+plan+pdfPDF 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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 11212 bytes
SHA-256: 81a3a7ed01ff33b70acf6d38a545b66dc0fbf8b1340fdcbb9cc4296c1db74228
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 18336 bytes
SHA-256: abb73bb593b297e4a63ad0e6bc28fe985efc634315ee978306285375b84e0870
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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