Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2c336ebe5bbaef…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 18:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebfe3909c61a0c0b8c369e280931e9c1 SHA-1: fd6f21e08aa90bbcdf5adbba3301701a1157733a SHA-256: ac2c336ebe5bbaef748414a487a32368a46ae90017a255cfd5bae21ec038f69b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external PDF links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to distinct, potentially disposable hosts, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://toscanafantastica.com/userfiles/file/givikemebovik.pdf In PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/pevamumebe.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/xuxedizinire.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/50061578173.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/nesajutamuvaz.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/91941776986.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406d6cac4f2---94533807250.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/jagagixakuzazemadusig.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/pibefulukop.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/vezafejen.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/92025830690.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/nodefagujalaseboja.pdfIn PDF document text
    • http://potlista.com/file/files/petidevasijafubepilar.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/lopipebanenusodemepolom.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/78487900056.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/boxanud.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/repufi.pdfIn PDF document text
    • https://hojoairport.com/images/file/tujaluzerizezitirelaro.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/158b28e28219e779ec1d3ac0b0eb3b99/gotojule.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/gurunifilojitubolorid.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/kozuluxubegojipafikawe.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/32511769418.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/fazeboxolewiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=street+fighter+vs+king+of+fighters+apkPDF 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_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD211 10824 bytes
SHA-256: de039348aeb7ca95b8d5a9a1df1397efcf8da405ca3ead44a44790ab6779d15b
font_02_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 17828 bytes
SHA-256: 4c5f424dde23ece0a1b5750b36c85f4f829881e878b52280a5c3e006c9f5e7ac