Malicious PDF — malware analysis report

Static analysis result for SHA-256 e292badf12fd935e…

MALICIOUS

PDF

73.1 KB Created: 2020-12-11 19:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f4d17bbd27bed764e3650771afb530d4 SHA-1: 92cb1b136a3894ba8ed7aec6a2bd9b95cdbc9907 SHA-256: e292badf12fd935e279bcd5d2e71a7cfd54c23e15fb99a59a22b867f3d8e6fb9
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9997

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/strik?utm_term=florence+county+jail+az PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fbbbdd7231d3.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/japif_tiwojex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_5fae3a97b67d4.pdfIn PDF document text
    • https://meribukefola.weebly.com/uploads/1/3/4/3/134314312/e2a55d91739.pdfIn PDF document text
    • https://fepuvagugi.weebly.com/uploads/1/3/4/7/134767339/pusimuko.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/be127d5131d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fba71d316a80.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/vutananewe.pdfIn PDF document text
    • https://repugololenip.weebly.com/uploads/1/3/4/8/134880500/xadavo-sugomokuxom-femevafowup-nekejanuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5fac213771a6c.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/ee16d0f0-cc8c-4114-b279-849164e9a5a6/13542488718.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/bavuvaremafokik.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/where_is_cruz_azul_team_from.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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 4796 bytes
SHA-256: efcf58ddb8c72d2e444bf77f36b778254e7406c02b686d6d228c9564ae00ecce
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 11052 bytes
SHA-256: d3495661f46a4dda034eb2465eb7151087f48ef0514764b6058db8d8780be8d8

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