Malicious PDF — malware analysis report

Static analysis result for SHA-256 746d8f0529a03273…

MALICIOUS

PDF

71.9 KB Created: 2020-11-19 16:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c9c05d30ee9658b9ab6e64f3851f884a SHA-1: c5f18e3de53e0395452c27664299fb254cf53274 SHA-256: 746d8f0529a032733e8c30f1badbb4ed5cdb1171eb0e44f012f845d832b1e040
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, suggests a lure related to 'Dan yeager chess'. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack vector appears to be the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?utm_term=dan+yeager+chess In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5fae43eec4c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457561/normal_5fb4e2ae5bd4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/hevenu_shalom_aleichem_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8817283-5217-4289-b4e6-4605a06d0ae1/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16877541-77e8-4bfb-9c21-bdcd0a95c7cd/kafizekujidirenuladeke.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/93576726358.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/28535715093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db64726-91b8-410d-9d6b-9591d14ca948/spss_veri_C3B6rnekleri.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/upgrading_and_repairing_pcs_22nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b144b3f4-3ce7-40cc-af57-4f8d6e0cfc80/xopebijogire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553541a1-1a2e-4f33-8b99-2c941adabfb4/20538147475.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/anime_4_you_tokyo_ghoul_re.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/retail_marketing_mix_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/cateye_strada_wireless_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb374b6-aa32-481b-b3f3-a2fca8178ca8/jiveritonaje.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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 5128 bytes
SHA-256: 46c2607fd861592cd6f29eed130721271afdf8603f45d2f8e1619e0e8335242f
font_01_sfnt_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10284 bytes
SHA-256: 7f18d9d2630eabd9c3ff6c6205b21f2dc6539575bbf0e0751efbb16ba2534734

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