Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e6506b30345b45…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 09:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6dd012b288c59473e49e85c739bb3071 SHA-1: 3a2752260b197d560acb4d16cf9a9bc8e4014b4c SHA-256: 11e6506b30345b45e1f8c553c3d31c8c950fa4eb9e1b309bef1e51d7daefb1c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, often disposable, domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=most+recommended+games+for+android PDF link annotation
    • https://ms01bet.com/contents/files/junimodis.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/4714959135.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/47120864726.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nunadifikazifofupi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc00c93f0---momewipuga.pdfIn PDF document text
    • http://esistore.com/userfiles/file/rovuxizenapipituxowekuzi.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/linofuba.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jobesekuzebakigitizalina.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/84927158286.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/30232176279.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/61768765394.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/waxexalofajuzenizefoviba.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021914161523639.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/32902567052.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/dowebasobetem.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/ginafuwukitejefo.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/10556568351.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/porufujafalav.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/16308779309.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/6189379202.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/fixetalisa.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b0f6b1b6171f7f02566ba630464d907b/zotanomejow.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/86254345512.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/31078914310.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/83730565340.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_off0000b233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 14788 bytes
SHA-256: 80cfd6a0f2886456c48dbb31e876e379502eea9628a8d74e64db56e27336a0d8
font_02_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 10768 bytes
SHA-256: b61b193824e40ecfc4198805aceba3c51c0ed44bc291561bf9889a537bbb9d42