Malicious PDF — malware analysis report

Static analysis result for SHA-256 15be03264a1fbda6…

MALICIOUS

PDF

88.5 KB Created: 2021-04-03 10:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ca8dc1aa0a91bf9acff2d461f86d3ca SHA-1: 2cdf70d474d50c18a10275f12828268a05eed373 SHA-256: 15be03264a1fbda65a01205e0b57be7af41bc4fea17257ef1c398afd4287f7dd
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/strik?utm_term=literary+devices+list+metaphor+examples PDF link annotation
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/xotesu-vofutirimizem-fasiworen.pdfIn PDF document text
    • http://insta-sale.site/html_and_css_tutorials_for_beginnersbx9kd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_602bddc408bb2.pdfIn PDF document text
    • http://gk-kuban.ru/the_evolution_of_the_eohippus_into_the_modern_day_horse_is_an_example_offh8gl.pdfIn PDF document text
    • https://sujezebaxoxil.weebly.com/uploads/1/3/4/3/134316131/zuzowape_futeduwexij_zegegode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_601d2cdf14d44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5fe02b1eb3941.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/xawuxan_tifawamike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410441/normal_5fee8514aa19a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_602e2b1c3040d.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/laponigiperugezaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_6062b0dc2f3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_601627cd08b70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_5fe77991357fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_5fe60f636aa31.pdfIn PDF document text
    • http://begdas.fun/amuchategui_derecho_penal2mlzi.pdfIn PDF document text
    • http://idealsit.fun/another_word_for_stressed_out_behaviorb3se0.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/b0dc4129-0ac8-4535-b51e-ab6e8b965017/why_is_my_furnace_not_responding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59ab318-e0e4-49db-99b9-1c6be8375e91/abraham_lincoln_biography_kid_friendly.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_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 5484 bytes
SHA-256: 4e041f3303dd2619bbac78fc6ce11c059d8cc9847ca7342f566947f239abfd14
font_01_sfnt_off000130dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DD 10564 bytes
SHA-256: 88e593e8a13ce7e21f8f0c2c0b45cef61535b388b635798a19b54ec538b9ca98

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