Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd09602cf225d1cc…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 05:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b68830c63fc3b7d8e2e0f14774134244 SHA-1: 2f51997e21ffbe79f657169f5c2c67e27cf33526 SHA-256: bd09602cf225d1cc2fee0d4ce5364ef29db589159dda8341841a40ba7f0620e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many pointing to PDF files hosted on potentially disposable domains, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bibliotekaludwin.pl/img/upload/files/wimiganijutajepokop.pdf In PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/10468910411.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nvbecrb1i11mjdrqmjg24luio6/70317689871.pdfIn PDF document text
    • http://trieuduong.com/images/Download/rulaludenizubalu.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/4136515660.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210904_081646_4639.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/feziwipalawuzodufofa.pdfIn PDF document text
    • http://ccadl.com/files/20210913222611.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/94479599256.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///40763191680.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210908233007.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/15d4c5a9f689909467db363789bdac19/lupiretede.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/wokuwasapakoruromet.pdfIn PDF document text
    • http://vecsecity.info/editor_up/40582434238.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/nisodanojavos.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/81011585812.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210914_B072E131829DE46B.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/nujafonorubugenimuwakad.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/50808997093.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gapisanikutufosebenufid.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/34062789187.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109031838367064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pubg+lite+0.21+updatePDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/56786812278.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_off0000c498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 10676 bytes
SHA-256: c1b4a46b2a766ea7368fe01a06e41a103372df2085c84e5f167f196883e713da
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 17612 bytes
SHA-256: ab24e70181bd5edc0515f8aebc482a20570e917af7839d15e4f0ca064f0e1238
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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