Malicious PDF — malware analysis report

Static analysis result for SHA-256 3579e499f7876ccf…

MALICIOUS

PDF

73.7 KB Created: 2020-11-24 09:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 69401ef1d0b1f1fba9046cd49e63c78f SHA-1: 1de4087a85c0bc176e372f5d9a14865fb2b6865d SHA-256: 3579e499f7876ccfddcc41df681222bcba4b402442f0a30bcd4a672c0f51e1f3
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, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were extracted, the structure suggests the document's primary purpose is to redirect users to external, potentially harmful, sites.

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://cctraff.ru/strik?utm_term=inspector+morse+infernal+serpent+synopsis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fa43ff8712fc.pdfIn PDF document text
    • https://siwinapevaz.weebly.com/uploads/1/3/4/3/134338690/vopunevovunis_towirawinevabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_5fa831b25445e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_5f9f6408a2839.pdfIn PDF document text
    • https://zuzatalo.weebly.com/uploads/1/3/4/3/134326893/kajasonurepadaj.pdfIn PDF document text
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/dikujenew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f9f6c03ba647.pdfIn PDF document text
    • https://loloxanasi.weebly.com/uploads/1/3/4/7/134712840/4232292.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/posufij/cuarto_in_english_word.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/my_hero_academia_ep_23_english_dub_funimation.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/medmaps_for_pathophysiology_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/tawogis.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/general_biology_test_questions_and_answers.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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 5200 bytes
SHA-256: 0514a20dab2bd516baa591963e1e8c267cd9111884722201af3ddfa0e25b3636
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 10744 bytes
SHA-256: bbcc294479109efc6bc2a0b92831d170c2bfb0a098a458589107b3763cc582b3

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