Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e86dc6dc114dccf…

MALICIOUS

PDF

55.3 KB Created: 2020-11-08 01:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 82707f564636ef9d969190cc733c1393 SHA-1: 22bd8b2846445fc2260738335a55d74469c24508 SHA-256: 5e86dc6dc114dccf2aa2a46d2a8c2a4740cea1c3b05ce92270e7220f12029772
214 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://traffking.ru/123?keyword=library+jobs+near+rowlett+tx In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5fa1ea5736fbc.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
    • https://uploads.strikinglycdn.com/files/9073de8d-749c-4e79-9650-e4bfdf68d234/jididikokum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b712f421-8275-4c5c-97c8-5af976245059/rodan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf0ccfb-fc15-443d-9c10-c8819ac5ec7e/41723952776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3425305-ae28-4073-af1e-0240ad40fc90/dragon_ball_z_games_for_psp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7415c78b-ca35-4fc0-bed3-bc14a36867f2/vujimunikome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b940332-4407-4c09-ac4f-0a3847e88991/joxufumobazevilejolavo.pdfIn PDF document text
    • https://tigifapenuf.files.wordpress.com/2020/11/foggy_dew_sheet_music_tin_whistle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa364b30-b525-4027-9bec-384a5a00cda1/engineering_technology_practical_guide_sinhala.pdfIn PDF document text
    • https://selogum.files.wordpress.com/2020/11/40721308403.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_off00008b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B81 4884 bytes
SHA-256: a197c59c1a971df526c0695345da60f9564f34c51064eb119f50dd339c1ef34c
font_01_sfnt_off00009c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3B 11196 bytes
SHA-256: 57d8cbab64d2399d315f1cb5113066b63a53e6f390aca8b22c872124d6a20579
font_02_sfnt_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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