Malicious PDF — malware analysis report

Static analysis result for SHA-256 239ad3fa79e92175…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 22:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1374103fa8825420c57904da7c22a56a SHA-1: 9e89cae5638a9480454da94fee4bed80d0ee7ecd SHA-256: 239ad3fa79e92175c2b74df304acbdd42811baac00f815780a8e052dd55d354c
154 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 disposable domains, indicating a link farm designed to redirect users. ClamAV also detected this file as Pdf.Phishing.Trojan, supporting the phishing and potential malware distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://templeton.sk/userfiles/file/damiwobimozejiruzunasi.pdf In PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/66718155744.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kulixage.pdfIn PDF document text
    • https://mediaskills.rs/files/kuvumokanowokuju.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917063101824.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d215e58d88---famana.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/22954950053.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/1341303425.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/sunufixomisapigu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/55979762454.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/14535505807.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/emimitazizeluzin.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zetekudifo.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210914_05C3A6A25718F63A.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wedibizipan.pdfIn PDF document text
    • http://saint-party.com/media/file/45310290478.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/43410396702.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/24879004877.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/32191043889.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/93268944570.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/lalemorakapipajonit.pdfIn PDF document text
    • https://manenshop.com/upload/files/lemipurofexolowe.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/momokolam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+turn+off+last+seen+on+whatsapp+androidPDF 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_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 17980 bytes
SHA-256: 9136ec5b84d1e0d485d1a73b0da7d1739ccfcdf898aaab72e4b141e3f312529f
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10772 bytes
SHA-256: d10762a1ecb004d7d6f8aa40ada812d5c99cb60e6d45e8819f22ae1d5b37d342
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1