Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca3d4b32de3c229…

MALICIOUS

PDF

73.7 KB Created: 2021-02-05 12:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: cb6a5cc0f01a8772955e20ec343262ce SHA-1: 9983067f9009f253838e260911f1307a5d24d7d9 SHA-256: 8ca3d4b32de3c229d25ae28bcac3ade01d8a1511836063db1503f65af860fc30
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/aws?utm_term=experimental+probability+worksheets+grade+7 PDF link annotation
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/wenepalofigelive.pdfIn PDF document text
    • http://pirawamajakemiv.22web.org/lineages_of_the_absolutist_state.pdfIn PDF document text
    • http://streichpack.online/horizon_7._8_treadmill_reviewsg0h86.pdfIn PDF document text
    • http://dusosax.66ghz.com/33600484198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fe0655709359.pdfIn PDF document text
    • http://podorokufexapal.iblogger.org/tor_browser_for_android_apk.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/8660788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424361/normal_5fcf3c00ea04d.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/migemiteje5q24d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5fc5c9127a4f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/english_worksheet_for_11th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/93298952212.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/62477756795.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/corel_draw_x3_portable._rar.pdfIn PDF document text
    • http://zusobowes.rf.gd/archer_t2u_software.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 5876 bytes
SHA-256: 24a42c0b66dd08383c15aabaa690c68d4077bc82e07633db6f5857e4606b90cf
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10828 bytes
SHA-256: a2d6b7f277ca512c188c7c8bbf3d2e077596e89ef39ae67e9e0d56b05a7f0ba8