Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d604236819e6c3c…

MALICIOUS

PDF

75.1 KB Created: 2021-02-17 05:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ef3d3268150da7cb4bd8fd0c2dcc2cbd SHA-1: 9f82b27e0974366e6aad380e62a77f584c784034 SHA-256: 8d604236819e6c3c8e9b1a4dcb5c5fed0fc8447fb1f6b2e7e08a09e9a1e9ed3c
214 Risk Score

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+services+does+primerica+offer In PDF document text
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/gizaruvunomunu_xukimufepetere.pdfIn PDF document text
    • http://buvanerupapuko.22web.org/epson_perfection_v700_review.pdfIn PDF document text
    • https://rufekelikofevav.weebly.com/uploads/1/3/1/0/131070689/7630954.pdfIn PDF document text
    • https://gasagadivegolix.weebly.com/uploads/1/3/4/4/134488570/51ae977e49.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/ajiiaNG/prank_call_ideas_for_your_ex.pdfIn PDF document text
    • http://bedusopuzal.22web.org/6333122028.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/laxujuwizokinexiteja.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/5e8709.pdfIn PDF document text
    • https://dimutaribosisup.weebly.com/uploads/1/3/4/4/134444719/5647626.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/miwuzokireb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foripoj.epizy.com/meeting_attendance_sheet_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/reportage_famille_nombreuse_tf1_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/brochure_pages_format.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/departmental_exam_answer_key_december_2017.pdfIn PDF document text
    • http://parubixus.rf.gd/39436251692.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/vifekud.pdfIn PDF document text
    • http://zatopava.epizy.com/rinitis_alergica_tratamiento.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_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 5436 bytes
SHA-256: ae1eecae808534106280035e6fac89d1fecfc24f75cba893f6727db1396a6ad4
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 11200 bytes
SHA-256: 386aab293e263eec133a72cf277a4f8fdb69e8d2baefaf9e5b9007e6e0a09fc3

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