Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4f31dba51174ff…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 02:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63bd7f7f7fa528ba3dc3699837c8c83f SHA-1: 37e71557656d66c49ed0849b60e56005442a1df3 SHA-256: 9b4f31dba51174ffef5c98538e76577ee6dfc4b08758e755e1522033f66e298e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish for information. The presence of embedded URIs further supports this attack pattern.

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://cructi.ru/uplcv?utm_term=fun+math+warm+ups PDF link annotation
    • http://atsolution.org/userfiles/file/20210911130259218789672.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/tisesefidokijezesune.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad474e85ec---34664083545.pdfIn PDF document text
    • https://hgb.se/filer/file/488989611.pdfIn PDF document text
    • https://labelmarket.pl/data/file/47639378418.pdfIn PDF document text
    • http://baoveantam.org/upload/files/xusur.pdfIn PDF document text
    • http://djapm.com/userfiles/file/masiludidomumuxa.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/pifaxizi.pdfIn PDF document text
    • http://bankerz.in/qpic/files/20317452511.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/pulilurorodapiwuwewa.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/22762497970.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/20803465686.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/wogadujijikefejumapabo.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/61700310925.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravufupuzazubedagenerol.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210901150613.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/wubupiwenikasomowoxa.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/soniwe.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/52707366783.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/79192015166.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f303380474---lokujorepadijirufenejugum.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/pimokewuza.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_off0000b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 15140 bytes
SHA-256: ae10b15dcea4230ea5d33d81fab3d8ebb01db45cc5207b51a25db1b39595651c
font_01_sfnt_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10288 bytes
SHA-256: 39177f917f8ccb5037ab9267a3c25adee213e76dd52cb35303697922ab182aaf

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