Malicious PDF — malware analysis report

Static analysis result for SHA-256 17051c8f2bfd02a9…

MALICIOUS

PDF

83.1 KB Created: 2021-05-31 09:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: af83bd6a65cb3538e0f1600addfd2bc0 SHA-1: e073f2e5c55add8771811660e1a79a2145c07dbf SHA-256: 17051c8f2bfd02a92414c99360cd433300de72551855b7b2f704146f47a14c74
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an external URI and an image lure that redirects to the URL 'https://leonvi.ru/123?utm_term=aritmetik+geometrik+dizi+form%25C3%25BClleri', indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL suggest a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=aritmetik+geometrik+dizi+form%25C3%25BClleri PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366317/normal_606e1b2f085c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393503/normal_604eb188a65f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_60250abebe398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_60241cde3faf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_60048aa4a4a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_603bc726731de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_6011890b23d48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_60571c7cc99cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_6003be535bb7b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462035/normal_60affb15651eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6021c4a489d46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_6001369c61b71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fd942f48016f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_5fe7dc939db64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408002/normal_60015bc8d4257.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3281fe19-5dd5-47e7-8f8d-5a7f2ba124ee/6430004647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe065401-4912-4fc8-b9ee-7e8dcc7ebabf/how_to_read_notes_fast_-_the_landmark_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea51714-bada-4921-85d4-5b399ca1cc92/under_the_dome_season_2_episode_12_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbed09c9-dbe2-4c7c-bab8-8576ee620226/is_asus_aimesh_any_good.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 5060 bytes
SHA-256: 391d229ffbc8784ebc228e87f9f706eafc67128877c3b81e346906be23ca239f
font_01_sfnt_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 2744 bytes
SHA-256: 88d8fa59f73467a5801b4d3dc043e867afc7825b78a30752acac051f02fda2bc
font_02_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 13724 bytes
SHA-256: 26ae97dc43a92ae9e66a5b8ee3df1610bd17bfb8946130159fbfbef1dc59950c
font_03_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16208 bytes
SHA-256: 23fb053ee487b225b4161442c5fb1c6616ae1957d1a3293f1c91e333b45a9988