Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b5af86d32655ca…

MALICIOUS

PDF

86.6 KB Created: 2021-03-14 10:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 06d283c6c0a09d25ed50a56fae5dc42c SHA-1: ddcc2f88c4755709a37bfa2cb73247d5b113a81e SHA-256: 33b5af86d32655ca4ae304155b6f4f6aa4fb672d81130f50b83ac3ceaaf29db6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure.

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
  • 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/strik?utm_term=how+to+change+code+on+sentry+safe+x075 PDF link annotation
    • https://cdn.sqhk.co/baxotonad/Zijb8F5/75807125180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5fd87869deac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480397/normal_5ff194575d7ba.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/igjamlg/68872411824.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/3jcgfic/my_talking_girl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_604db0c44296b.pdfIn PDF document text
    • http://securityverifiedservices.com/why_wont_my_rca_7_tablet_turn_on4rrks.pdfIn PDF document text
    • http://austritkfa.com/sims_3_vs_sims_4_graphics_requirementsy2gev.pdfIn PDF document text
    • http://thedouche.xyz/22857324326hoid8.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/wazorixekunafob/15224939150.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/meaning_of_cartel_formation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131502d5-7ffb-429a-9044-5249e6d86cc5/why_rna_uses_uracil_instead_of_thymine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b77141-d30d-4d72-8e61-71162da981e9/pivasiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c887438-7dbb-4d61-b857-d8bc9523dc0e/99542841472.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/tisco_apprentice_2019_form_date_jamshedpur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032ed200-09d8-4d1d-9719-1bc1fbda8b32/77721741710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54eb854a-510f-49e2-8316-c281133c19de/92917092708.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_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 5820 bytes
SHA-256: a7cbacd84be73f760801983e5595bf081f652d73212f405a86213a9cbb7ec1bd
font_01_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 12184 bytes
SHA-256: 79d8f47e095df2e8308e364b61f53284f12c163079209222d2858b1bb432abd4

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