Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb079937dba3010f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-25 15:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6d7bfa56388271f7ead3102af53a860c SHA-1: 7474a69cd194a27625fda4f9c770b015ad1b73c8 SHA-256: bb079937dba3010fb6c9d238416ebcdf0881b8a5da9aafc796ac85b1be7f8814
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to potentially harmful sites. The presence of embedded URLs and the overall structure indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 4

  • 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=gta+v+skins+for+gta+sa PDF link annotation
    • https://tckontrola.hr/files/85479925805.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/fojiridobobetufala.pdfIn PDF document text
    • https://cargobull.cz/res/file/dupigerupagusemunaramuwo.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/16729889425.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/sijegivepikol.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/87343481192.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/salatir.pdfIn PDF document text
    • http://potlista.com/file/files/jizekovatonurudesujogido.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090208362975.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/xikewi.pdfIn PDF document text
    • http://ombs.ru/uploads/files/83798355012.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/89335234901.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/88558321519.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109210846537907.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7a81a3308d70a1ec1d2ea3b7e98388fa/tufonolomesunin.pdfIn PDF document text
    • http://fedime.org/imagenes/demiwopobez.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/guvituv.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0a62ns53qu4i58pd48mlgn0jj7/damugiripoxutepi.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/vujabovatexupixu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33256870047.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/4928586016.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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 19072 bytes
SHA-256: 1834d13c15b5ff17a19a777513fed42264c754300bdfc92c167e4cda99b26f5a
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10408 bytes
SHA-256: 45bcdd4cfa2c9cb93e771f50ec463e67cb8cb443dc50f4e06a0bd414334be4f2
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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