Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2884e2ab418e7c2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 16:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 439881366f390cad5106fdbfdff8023e SHA-1: 5beb7e2a4c099291aebde951716bea1e95533019 SHA-256: b2884e2ab418e7c2d887fe700863c35319f3bb9ddac06fe1551c7989771ac4ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the ML classification strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=comment+pirater+un+compte+facebook+avec+mon+android PDF link annotation
    • http://ihdbd.org/upload/files/noruf.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/xotomisefuz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4e2ad419---13718266236.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203a665a92---tufos.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/nefimukawupesa.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/wapigezedanudivox.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xajufafifolitotoluzi.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niraxuximawumejeborad.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/65277202099.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fakipugitiwabebikak.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/58890117728.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/55870436716.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///26394745894.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/surumuweranuwo.pdfIn PDF document text
    • http://1careglobal.com/upload/files/9734237792.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/jemafafuvirugeralife.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/26202956934.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/41946188475.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vimawet.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/vorufilolenom.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xifugemifavogixitoxodizev.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/pikokujazonefobarixom.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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10996 bytes
SHA-256: 1bb43a805775cf1139d29a07318bb779df949523037eef5823040a79a47ab9cd
font_02_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 18224 bytes
SHA-256: 625607913168ab66f07e3e6f3c09f2f411ca5de65d80c95de7c1a68af1c9cbc5

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