Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e98a25fbc40392…

MALICIOUS

PDF

78.2 KB Created: 2021-09-11 21:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1230e7c911a3e5ab4d27b6b7ce131f64 SHA-1: 1931bb80a73c26cd158796ea9a4c5c47875d612b SHA-256: c3e98a25fbc403924e38fbbaa6768c2fb8a3f9fea9f62f5e37fd61d50a8a53b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially compromised domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this. No scripts were extracted, but the overall structure and URL findings point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://obermeyer-modemarkt.de/upload/file/31644240724.pdf In PDF document text
    • http://noithatlekhanh.com/Images_upload/files/80848120085.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/43357893130.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/69627011156.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/98812505150.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/lamoxamotimeseranog.pdfIn PDF document text
    • https://atlantidegattico.it/file/63365050374.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gogenomarefalusudariror.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/paxukozetodixin.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/48353484991.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/womuxinarulifa.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/migikuvoropuriboduvizera.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/36578544600.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/22227334288.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/5042055986.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109031621129964.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/jikuterabimabefubedaboma.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/melidaxizixesekukit.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/72086565610.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad0707bc---1470265989.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/8988520328.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/918555105.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/57857057943.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/86195669279.pdfIn PDF document text
    • http://hbaoge.com/upload/files/28575110786.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/76905046285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=open+world+games+android+downloadPDF 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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10748 bytes
SHA-256: 184ec88bc0da525ffcaf5d0ee4224bad751697d7ae45dcc48a7d3293d564ea34
font_02_sfnt_off00010099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 16376 bytes
SHA-256: 8c08f8843e4245a3e04d46ebbab6d3fc81e0f6151510bfa870e16517102daca3