Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d41dfd710cd149…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 04:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8b4ca337afa46b31696ed59db268400e SHA-1: 8b9f31f30701bbd2578356612f9b4a423377636e SHA-256: c1d41dfd710cd1499f0b9fbb26c0fea89f157f716e5722ba957d723b7381cdd9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were extracted, the presence of external URIs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=ashrae+fundamentals+handbook+2017+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421038/normal_602b351fd7fa1.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/9mjjZjj/16730628233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_602ab2de68127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fe51cd9a8397.pdfIn PDF document text
    • http://dozawudefe.iblogger.org/72488419027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_60136b87b0bcd.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/O5Vhehj/matrix_organizational_structure_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nelozud.epizy.com/can_t_help_falling_in_love_piano_sheet.pdfIn PDF document text
    • http://fekaratog.rf.gd/kujilebebafifobajitasam.pdfIn PDF document text
    • http://boraxatisota.rf.gd/mjpru_b_el_ed_online_form.pdfIn PDF document text
    • http://luwegovufa.epizy.com/rigeb.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/canadian_cancer_society_cancer_information_service.pdfIn PDF document text
    • http://maderenefozido.rf.gd/91515345378.pdfIn PDF document text
    • http://budakofis.epizy.com/biwowel.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_0dc419cdf9914c6aacd5277c7b2bf48a.pdf?index=trueIn PDF document text
    • http://tofezininas.rf.gd/67300532642.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_a4b6c1e5204b478d8c3faab8ff9f2ab9.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 5712 bytes
SHA-256: a0f9b7d906d4100a0272c049c3fbdd53c1b6b903a104771919a32c839c3f41a5
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 22012 bytes
SHA-256: 5d8186306b5195e67f3b9b57820180aa24afcc44b23e6f0256c00de0932f4081
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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