Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3c8cbcd6fd2704…

MALICIOUS

PDF

81.9 KB Created: 2020-12-31 09:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8fd7c885ed238402fbd5a8c7a8986ba2 SHA-1: 1c5d75111d4c5666b011c042c0eb5e78a2cce2ef SHA-256: 8f3c8cbcd6fd270484e8f83abce233d3f1932afaa3a7253b4db0a2d34671b121
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious sites, likely for phishing or malware distribution.

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://gettraff.ru/123?utm_term=characters+in+frankenstein+chapters+1-4 In PDF document text
    • https://cdn.sqhk.co/xuxumududu/eEHjjid/queen_greatest_hits_offline_full_album_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494657/normal_5fb88c0d03595.pdfIn PDF document text
    • https://musazowoxagaw.weebly.com/uploads/1/3/4/3/134323980/jufunuvozuvijas_tomora_fejopupire.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/xajowu/kemasije.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/casino_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/xutivikinuwumomolovalor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c62648-2499-4808-80a5-52a3a71172ef/android_chrome_browser_video_download_embedded.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/pregnancy_and_chiari_1_malformation.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/community_acquired_pneumonia_treatment_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/inverse_of_a_4x4_matrix_using_cofactors.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/13105691913.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/12841890002.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/alfonso_reyes_zubiria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d26c4e-3693-424f-ba0d-ac9d00828a4d/laberintos_dificiles_para_imprimir_g.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/charly_black_party_animal_audio.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 5212 bytes
SHA-256: ad759c422eed54d5f6f293a7d992fb64513c925b4b24a6ead8110cde3e5e405f
font_01_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 10760 bytes
SHA-256: b7f230e90d9f5727c92b238911f6452b2036592bf629db40e5591b223df2b177

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