Malicious PDF — malware analysis report

Static analysis result for SHA-256 949c970cf9fc3392…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 11:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ecc9e05bddc870e6c7b92cf0589b86a9 SHA-1: 984e071252431ea3e7b148cd69b9721fbceaeb18 SHA-256: 949c970cf9fc3392e77229b70ad465de394aa6fc1c1b82785be46a39a7337c9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the overall structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=prisoner+of+the+mountains+watch+online+free PDF link annotation
    • http://z-sinpro.com/upload/files/19847331435.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210917034840.pdfIn PDF document text
    • http://szcftz.com/upload/korekagiv.pdfIn PDF document text
    • https://petek.biz/resimler/files/xefipemopidesavew.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/niwujepixomaxikuloga.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/tupuzoxuf.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/7453390279.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/85995720460.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/zanunosilowulefalo.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/84576467831.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/21784561825.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/jobanuwimeber.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/87883991053.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/94227485727.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/25451350818.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161344cb30b2f0---kopubigigojokefizenip.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219152148586481.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/bakufira.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/21304499697.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/2957772747.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/zebolisap.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/94315404398.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/pewexolun.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_off0000be8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 10788 bytes
SHA-256: d83215547792e40922e98c899c8c4dab7be565b3f17948331658b73d38422203
font_02_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 17084 bytes
SHA-256: 74ef47f1de63b9edb23b229e552118230cba0f916429e013c6ac973a03e351ab