Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fabf31cedc089cd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 09:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 957056bc2b845702b4e1257a6aa97eb2 SHA-1: 989a7267fc42d7f0b44bff7e9e6ce146ab826c7e SHA-256: 9fabf31cedc089cde09b57686c5b74fee364cf8865a7d2e1f7536af685e89aad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous distinct hosts, which is a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/e0fb0157dcf72b11bdf14ffab8823d60/31600563598.pdf In PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/lirufuka.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/99989376095.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/jevejapopujeb.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/suzizoxodaten.pdfIn PDF document text
    • https://jss-moms.si/upload/File/wuriniriboxikopew.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/garavefipuwepolukigip.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/sirabapiragek.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xetavinamewakajavojerid.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/74235191197.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/48872384607.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/4928807337.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/gukajaso.pdfIn PDF document text
    • http://cocoal.com/uploads/file/95399619811.pdfIn PDF document text
    • https://venus-forever.com/image/files/75660690484.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/80185147811.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/90219477094.pdfIn PDF document text
    • http://www.polni.si/Images/files/66963864870.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/63114851150.pdfIn PDF document text
    • https://capecoralliving.com/media/file/tigepi.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5f0c045f---mumuzajekomejarivowag.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/82840956122.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/80773096158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hard+reset+mxqPDF 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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 21760 bytes
SHA-256: d86bb001c8ea99dbeac647444413d0e312709b87f71852edf4006e6a9cf3fcd5
font_01_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10288 bytes
SHA-256: 71dcb829e888b461703e61203f8a06ab5f6e48d3513b8d8714897c982c2b2697