Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e956b3822d533e…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 04:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c57ec9ab0c16de55df35fa2d63841ab SHA-1: f759078db8d45fdffe0d8b7fc5b2cee092c9cc48 SHA-256: 75e956b3822d533e417557d93a21b41d9e72ee0cd3d4d2d6b6d2a82b71c42c5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that likely lead to phishing or malware distribution sites, consistent with a spearphishing attachment attack pattern. The PDF structure and embedded content suggest it is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=reading+comprehension+rules+pdf PDF link annotation
    • http://daiwavn.com/uploads/image/files/moforafedu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5561f1d1e8260efb8236637cc6038cc6/lejunisasinoli.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/kokomerevotalax.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/tefef.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/64379292873.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/bitugutaj.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/gamegokunik.pdfIn PDF document text
    • https://inks.bg/userfiles/file/31308209765.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/3820143467.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/wevixasetezapedav.pdfIn PDF document text
    • http://apicn.net/upload/files/87496515167.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/61764133133.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/59006222740.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109110053133101.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161345d031de70---95824005982.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/29639686240.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/98381172218.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/85643061062.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/51492341820.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/48392766904.pdfIn PDF document text
    • https://aildf.in/userfiles/file/jutunaxuzabarekom.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/67832454716.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/78762332036.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/pokonilovututo.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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 18048 bytes
SHA-256: 34bfa8d838f7176496b2d7f9e40a924202d732744fc8ce879dffb2747b3170a8
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 11112 bytes
SHA-256: 09518e9c03c61a2725edc2ba92cf4611a7a87b68eeda73febb7cdb61b7da1669

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