Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc93e1b4ecb32535…

MALICIOUS

PDF

371.4 KB Created: 2021-03-26 08:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 860133c8e4ac6366b63bff724436906f SHA-1: bc8104ebe2c4458521545898b300fdd0011f2392 SHA-256: bc93e1b4ecb32535e6beac1db8c314593a1e1e4372f99dbcf9f8f020b4669ac5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. The embedded URLs and the document body suggest a lure to download a technical document, which redirects to a suspicious domain. This indicates an attempt to deceive users into visiting a potentially harmful site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/wix?keyword=mechanics+of+aircraft+structures+2nd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387565/normal_60217ade24ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_6016f3cd172e9.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/what_is_the_major_objective_of_the_affordable_care_act_quizlet.pdfIn PDF document text
    • http://bit7.top/how_to_setup_a_brother_printer_on_windows_10kwf3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_600c71ccca554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6033215d7cc76.pdfIn PDF document text
    • http://app-3null.com/furelibolokalekitelunoletvjakv.pdfIn PDF document text
    • http://ilkertr.shop/pinagesebezewekajalugixubh6tfw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_603e63da93b3c.pdfIn PDF document text
    • http://stassikorskyi.com/how_to_operate_plasma_cutterdbrm3.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jjUjhhb/61802326091.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/ahbhgij/easy_skateboard_tricks_to_learn_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_603e5a827a90a.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/hYKifDC/emergency_dental_services_syracuse_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/tinukomafiro/iFxjeNY/anime_girl_hd_wallpapers_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5fec5c69efcd2.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/hjHbjih/wejemunirupunuzuximu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_6038ed0ebfc0b.pdfIn PDF document text
    • http://snt-br.ru/cbp_nafta_certificate_of_origin_formx23kh.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/sZnjfTr/arrow_ups_warranty_check.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_603949c40abde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5fdf4d72a492f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naburonip.myartsonline.com/jozebapidofite.pdfIn PDF document text
    • http://pekamidakoj.atwebpages.com/aashto_design_manual.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://scripts.sil.org/OFLIn 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_off000559ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x559EC 5348 bytes
SHA-256: fb49ac213aa750616e34e4bf25fcfb3212907cd51bee85f55363adfcd4110e87
font_01_sfnt_off00056c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56C25 15072 bytes
SHA-256: 76f514636f953c83e531a3c06922b834fab889253a2bdb878f0d96e8cb269ebf
font_02_sfnt_off00059f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F90 18064 bytes
SHA-256: ae42be2598bc4cdbbb538ca79d8c69dfaf5988afb06117067d32daf21d409479