Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b899e358ba94060…

MALICIOUS

PDF

74.8 KB Created: 2020-12-18 00:30:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6f65185dea9b5e0c1b8b1f43680817a7 SHA-1: eb0314fa269587ed04f6b4b75b4f5fb00966bed3 SHA-256: 4b899e358ba94060b3443ed57b16984493f339d580e5c5126649d8365f7ab106
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary IOC is the redirector URL used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=angular+drag+and+drop+form+builder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_5fa4e19834cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9897b001097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/lunojol/sort_data_from_multiple_sheets_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c345302c-678d-4da7-8261-4187230c0ac4/xpadder_mass_effect_3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d92f11f6a4198485658d/t/5fcd353724c49707d32a55ea/1607284025226/maximum_carnom_lego_marvel_superheroes_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17d37b2-0f39-4200-8382-3106de104490/the_red_umbrella.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/kafojumudeluwo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fcf5405d5340f32a0ba8/t/5fc576ab3c6ccf69f31886c3/1606776494072/toyota_mission_statement_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/chrome_for_windows_10_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/vopujibikozitelar.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7bbd303f04e270fe68033/t/5fc83e4b094cf7617db9e0b9/1606958667923/22334630170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b478107-c3a9-46a3-bc4d-257904a4b499/average_fixed_cost_graph.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/47315891010.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 5312 bytes
SHA-256: d9e7e9c4a83861e135cc9adeb04ce7766f938ef91d4938d97e0c05b2e29df588
font_01_sfnt_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 8496 bytes
SHA-256: 39be67d2e04cefbc5cb01fd3a5720a1b561736768fd9e869b39fa0c236a817a2
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 11744 bytes
SHA-256: d6e6d9fea25932fd9b7d3f28d1a2507df5d652aea3be7421757239aa38ce5a49