Malicious PDF — malware analysis report

Static analysis result for SHA-256 096ace0179430a39…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 14:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b22b544cb6313eeb7e1fb81a5f208f7a SHA-1: fdeec56f33aecd731e5b53c5ca214cbcd5b66584 SHA-256: 096ace0179430a3979066f7d38422c70ffdcefcff119cf591499c18e5b83c6a4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=three+example+of+system+software PDF link annotation
    • http://wpscrm.in/uploaded_files/userfiles/files/69193225647.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/94416826309.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/35041920986.pdfIn PDF document text
    • http://mobiliteit.nu/files/vajafoweximu.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/doxizironep.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/robenimudeluxume.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/70703114403.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/zolopovujajefixujijanab.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_132708.pdfPDF link annotation
    • https://soechi.net/userfiles/file/bopobatufegore.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131692fc8251---rofetewubefupu.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/14015637355.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/30569928446.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/41489964980.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/vuwevotapusulik.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/mukafafikunegataxarara.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/86118025883.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109161253393410.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/13466659014.pdfIn PDF document text
    • http://artospace.com/pics/file/74850006996.pdfIn PDF document text
    • https://armenia4d.com/contents/files/93087231901.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/68341359580.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_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 16888 bytes
SHA-256: db5819646a0df771c4000154de597502a6c5a2b8e9afd06d1ec2ba21033552ca
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 10692 bytes
SHA-256: 4205242b70e3c21c5b0aaf31b0adea5bc778393c0678f28f4b362b1ab5ae8e4a

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