Malicious PDF — malware analysis report

Static analysis result for SHA-256 85530a9e898aab03…

MALICIOUS

PDF

70.7 KB Created: 2020-11-17 20:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ed2fa04d94f5280728d2887db38d4d5c SHA-1: dd624adee59a442b3e71173b6eb9172bc402e96c SHA-256: 85530a9e898aab03e446afacef5bed4070398f3ec1c9d54f39b349a76414ee70
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/strik?utm_term=juegos+friv+com+250+gratis+en+l%25C3%25ADnea In PDF document text
    • https://kavimexidulivi.weebly.com/uploads/1/3/4/0/134040988/ec13ed41.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://uploads.strikinglycdn.com/files/94e7e858-5f45-4f9b-a643-111d2613c2a9/atividades_de_caligrafia_alfabeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8992eb-c324-4fcd-9a83-c3aa0ad8237d/nivenarofamoguvajasize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3c895a-3a2e-4113-8ca6-716cb547f3b5/womewore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0bc8eb6-d7cd-4197-8dfd-e6a1d2e9ed9e/advocare_breastfeeding_24_day_challenge_meal_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/zesetobaxevefobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd2abaa-57ac-4e6b-b678-83b723875e65/rarowiweb.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/54171534785.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/gameboy_advance_roms_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423eccbb-710f-478f-8754-deadbaeb7a6d/dj_mustard_hey_sample_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc26b010-87db-45f1-ba0e-340942640816/zadadoreniviru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8218c992-7d93-4f99-9ec5-1ae07b4debda/28207845193.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_off0000c51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51A 5700 bytes
SHA-256: c7e7f4f1c474072ba5304103f5e6b839965015d8fba9b37afe489df883468cbc
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 6748 bytes
SHA-256: 1f465570f21767a2767c6b22dd6f2e1991420bc72f5d4a6a2c5158e806a03c2d
font_02_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 10204 bytes
SHA-256: 7dcb67a3ed11d53316aebf7bb5645b8b11896474b16124629a35ae7746678296

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