Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc737d392f7562c0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 18:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ebbba50400de4e47f1165a45931ec0e SHA-1: 2989912992b30d574932326ecf20f7b109806a6a SHA-256: fc737d392f7562c0a29baab63bfb73f41000b765e907cc7cc7d069ff0e98be16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/66764724083.pdf In PDF document text
    • http://tai-yang.tw/taiyang/upload/file/tubipexik.pdfIn PDF document text
    • http://servmed.net/userfiles/file/revasixojemixedonire.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/50347574577.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/janir.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/28119014834.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/55246233185.pdfIn PDF document text
    • http://fteq.ru/files/file/70101636679.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/2526109551.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/vasixezasetuvomapatupaf.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/maxogabufosabekanoxeto.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/82817522955.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/71826495770.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/mibinixoz.pdfIn PDF document text
    • http://wwsm-us.com/files/file/nuwojikerisexafuxidokita.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161401fcbd8e6b---sodosavinazekibanukutidu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131433655e5d---18398672198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=saba+safer+mod+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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 17592 bytes
SHA-256: 035cfc488843140db83f29fdb76b1a05e99b04c74b6fbf4a6ed8de3e12a419a7
font_02_sfnt_off00012c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C08 10860 bytes
SHA-256: 0eac15e9550235bdc80c7451eefa268511e336a73d1e749eaee8f085e181b257

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