Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e9ed369c6c1e04…

MALICIOUS

PDF

78.6 KB Created: 2021-03-19 10:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3bab181ad31a06c11f5d3bd9ae602f3f SHA-1: c2f83a2603602e5a58dd8f9ee6f9e59a61efd5ed SHA-256: d1e9ed369c6c1e04c907412d07e613ca547c84f5548cc5b711cf621e3e2a0f33
142 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. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/wix?keyword=sales+receipt+template PDF link annotation
    • http://artyom.guru/najuvuwolitudy1av.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_60436a06c8c34.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/rigavutotetemamo.pdfIn PDF document text
    • http://natbeach.space/103458881872v4r1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459036/normal_5fc5f782ca79f.pdfIn PDF document text
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/1239873.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/vototofatoxotugiwabem.pdfIn PDF document text
    • http://valuburikodajad.medianewsonline.com/is_rinnai_a_good_brand.pdfIn PDF document text
    • https://bojozavo.weebly.com/uploads/1/3/0/7/130740433/tikazagabiw.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/infectious_bursal_disease_in_poultry.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/what_is_linear_plot_in_literature.pdfIn PDF document text
    • http://yesstore.pro/difference_between_grounded_theory_and_phenomenological_researchhdq9i.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/5ede322c3c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namepafubi.atwebpages.com/costanzo_physiology_6th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8209d839-0cdb-4709-a2a1-9afc4aef9165/shirley_jackson_scientist_biography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff039273-7486-4364-9929-d921c685620d/443944896.pdfIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/vufugapeja.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/vavefagir.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_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 5180 bytes
SHA-256: e1f81a5a8f9f7d8680be11178b0e18d7f29c2c6e4c901dcbebc7cd63d0d15270
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 11036 bytes
SHA-256: d4206fa7b5a9d6f0802cab7bfb64454475296ea374a32ec99fe93b6faff2bb6d

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