Malicious PDF — malware analysis report

Static analysis result for SHA-256 78db973f0084bafd…

MALICIOUS

PDF

84.6 KB Created: 2021-10-08 13:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79726e9abd9b78df106603693cda31a8 SHA-1: 3141d725571988e8f4d8a603239ecbfaa2c2c866 SHA-256: 78db973f0084bafd9ee96ec55a5f28722823e5a75d491508c926579ece84788a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Numerous external URLs were extracted, many pointing to suspicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=post+utme+past+questions+and+answers PDF link annotation
    • https://ykitraders.com/UserFiles/file/62977664151.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/22789953187.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/ridiwuwajo.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/bokurofikorarodonizar.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/44224855474.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/46080708927.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/72285440661.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61594e1bee9b0.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/wetuvawuxewetunaxagoxad.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210909_86E4765618EEC0B5.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/615a478a67a8a.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/fosol.pdfIn PDF document text
    • http://tano-cable.com/d/files/69865106414.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/tukejedunijifipij.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/falakememodozomot.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/bekemuvupiw.pdfIn PDF document text
    • http://qdjshg.com/files/file/64970665531.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c9b73a91d3d9fa097754e15590c9c07c/xedek.pdfIn PDF document text
    • http://sungder.com/upload/4509312500.pdfIn PDF document text
    • http://topstec.com/d/files/xunegujisakevukuwuf.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/2196949497.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/sifuj.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 10840 bytes
SHA-256: 59e7665272d191f247e8ae4665698bc18bfea3c7d780989be4eef2cff074fe1e
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 17684 bytes
SHA-256: 97b056ead208d014034fecade9341096797d8225bf886c32b502870190883ee0

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