Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbccf5a7d30ca2fe…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 16:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b52a1bda34715b90c8c8e0eb10e78898 SHA-1: 17ee0bb830b7384b19faac511234844c04d3ac87 SHA-256: dbccf5a7d30ca2fecfcb02385fd7a69f7e914c12539d8bb2fdd43b306930e545
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely involving a second-stage download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=how+to+draw+yourself PDF link annotation
    • http://zamdq.com/filespath/files/20210906112236.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109081554411466.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/68dff3e03f2c49d840cf44cb3473ef0e/25326572168.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/lanexafareveruvewedar.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/35630833851.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210901132221.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/29314489254.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/puseparavevatin.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1630523709c59d618bbb30986c8408.pdfIn PDF document text
    • http://sinostandards.net/upload/files/68149847353.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ncdajkhmnq9vbq0blub2idhqc5/56349633344.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/28742166762.pdfIn PDF document text
    • https://12tiga.com/contents/files/bisewanubiluribaro.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/wowopijorisobidavogugedol.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/96498698135.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/27165826668.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kelawalojewuwaxewaledu.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/61477621560.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/8912782284.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27035665915.pdfIn PDF document text
    • http://talesma.com/E/file/82995596314.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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 10440 bytes
SHA-256: 9bf13e729360840bc52db98481f165a3c49757d140a5a9f5b3fe29a979afe56c
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 16504 bytes
SHA-256: 3f218058c46cac72c15be969790dceaabfeb69d0eed6b059821a15cd1d609aa5

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