Malicious PDF — malware analysis report

Static analysis result for SHA-256 65206a7b2a386f6a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-10 20:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47b340ce694e3a62448423f8248d1b40 SHA-1: ac70abafb5e6239a9ca661a9e8e5523d3c367623 SHA-256: 65206a7b2a386f6a00483b6158375d1a4bf80ef03732a98dc48ba9bb93492c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dfnaeg1mdo9gr6podrsnqm9ce7/83048508519.pdf In PDF document text
    • http://zulassung4you.de/bilder/file/vejilulimagew.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/78655940246.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/84249845947.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/doxivikofufofom.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/40479292783.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rexeloji.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/vulavolojexuvezigudeni.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/68931455978.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/kadavubijafifokobiwo.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kedidalogasunakijexasun.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210910090454.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/56477880954.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nataxojukibe.pdfIn PDF document text
    • https://jurad.eu/files/file/47049695494.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/wopejisesodoxotivixogetal.pdfIn PDF document text
    • https://micsys.in/userfiles/file/53259507239.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/9164523780.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/42611249173.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29f589ee1---65099237075.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/1341812315.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/72329708008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=akinator+apk+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_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 18468 bytes
SHA-256: 500fc2d043447c340c861856c9b9180a75074ea7c9ef74a7d6864532278003d6
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 10244 bytes
SHA-256: d93a71ab14a6abf0ee0f64ce47110b0ba22cfda9b1da8022e4c86dfdac9968b7

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