Malicious PDF — malware analysis report

Static analysis result for SHA-256 7331f3da1dd7c6de…

MALICIOUS

PDF

75.5 KB Created: 2021-02-14 17:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d61f112d21fecb39f0e2068438dcf9f5 SHA-1: f8f4fe3c4e6e34d879f793fa8a202df3c92ebc5b SHA-256: 7331f3da1dd7c6de33867109b824f3e237d5ba49060189fc42a9f95e12dd0cff
136 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a redirector link, specifically identified as a 'free-download phishing' lure. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL, https://maypoin.ru/123?utm_term=john+f+kennedy+leadership+and+learning, is the primary indicator of compromise, likely leading to a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=john+f+kennedy+leadership+and+learning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5ff6568917918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_6001047d4a6ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451205/normal_5fe47f118db2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_600e4f66e0278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456996/normal_600cc3f1d57d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426421/normal_5fd065edeafc1.pdfIn PDF document text
    • http://wumokejo.iblogger.org/30282012473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5fd30117e4f1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bobujosu.epizy.com/gaxasagoxekugunep.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/free_printable_pirate_sword_template.pdfIn PDF document text
    • http://sekijipaladi.epizy.com/chirodini_tumi_je_amar_movie_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/authorities_under_information_technology_act_2000.pdfIn PDF document text
    • http://luvibiw.epizy.com/bakaxez.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/polilozejarod.pdfIn PDF document text
    • http://wotolag.epizy.com/jogapejufaf.pdfIn PDF document text
    • http://bujisovi.epizy.com/shaun_the_sheep_cartoon_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/sunday_express_magazine_prize_crossword_answers.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5168 bytes
SHA-256: 5066cd83a37d8a636fb89a3f6562e6d0ef5c51b8bcfadf44179c5734f6f52c3c
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10888 bytes
SHA-256: ea69ad0e960dc1dd273cb8035649f18c5c58b42e70db328ce22e61c9e2b59b92
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34