Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a6e8091467f233…

MALICIOUS

PDF

63.7 KB Created: 2020-11-18 01:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6b761d4b8d88591447d245ded4a9b1ba SHA-1: 2411dcf33b0f387e678bd39abb4a80d08f3c0e03 SHA-256: d0a6e8091467f233ed714ba7e24a8f5a4cfad809d93d4e56c36f087d482a2089
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 0.9998

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://ggtraff.ru/123?utm_term=vocabulary+in+use+intermediate+with+answers+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fa7eef7affa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fb32d45b3d59.pdfIn PDF document text
    • https://wazajatagif.weebly.com/uploads/1/3/4/3/134376275/vekuriseja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f9318db30b4c.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_5fa45b94b5827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fa9043c62345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417312/normal_5f9e7fd4accc4.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/1752b4f0-8501-4f22-b802-e233bd12ae06/76453955120.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/american_falls_academy_idaho.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbd1952-bfb8-4fac-81d5-0f75872a7e14/lokotudelinemizagud.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/pebovepanarowogix.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/vba_adodb_open_recordset_query.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/how_to_pack_a_punch_on_ascension.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.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF9 5692 bytes
SHA-256: 5d554424f44a6e980941f527dc225128d387cb265555fb388f09a1bd085e0cb4
font_01_sfnt_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 10368 bytes
SHA-256: ff8ee323afeaca72c62e22925344d21a71f5692b0f0ec32d21d774c1aaffa9ea

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