Malicious PDF — malware analysis report

Static analysis result for SHA-256 2728690330bddfc6…

MALICIOUS

PDF

79.8 KB Created: 2021-05-05 15:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe8d07a387bc9e5754b8c64057ff7501 SHA-1: 2ecd20852c237dd0f321e069f821e99a8a1dbc65 SHA-256: 2728690330bddfc6114f0f100f7cdbb465db868df9024051954fe38908a364f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. 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
  • 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://resalured.ru/strik?utm_term=where+is+stairway+to+heaven+hawaii PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407789/normal_6008f1ea2478b.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/filemogaxiba.pdfIn PDF document text
    • http://rinetezomado.22web.org/advantages_and_disadvantages_of_free_trade_area.pdfIn PDF document text
    • http://miraluvofizobe.medianewsonline.com/zodinekipewep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_605ce5406627e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5ff5bf8f46559.pdfIn PDF document text
    • http://gonugotez.22web.org/a1275_transistor.pdfIn PDF document text
    • http://vesimawamom.66ghz.com/21328518778.pdfIn PDF document text
    • http://jesiwufap.iblogger.org/vba_ms_word_open_document.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_603dd10c0b363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xazomagojuwa.epizy.com/mountain_bike_training_program.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/gagojokanufapigoredi.pdfIn PDF document text
    • http://savekuf.rf.gd/bomapozolubu.pdfIn PDF document text
    • http://nulibipegetoko.epizy.com/wordly_wise_3000_book_7_test.pdfIn PDF document text
    • http://tulazonakem.epizy.com/receita_de_salada_de_frutas_simples.pdfIn PDF document text
    • http://pevibizedafi.epizy.com/77647165908.pdfIn PDF document text
    • http://zojabavikejowi.rf.gd/cantilever_scaffolding.pdfIn PDF document text
    • http://kurujabarufuxe.rf.gd/ws_ftp_windows_10.pdfIn PDF document text
    • http://poxemibusap.epizy.com/pdf_file_converter_to_excel.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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 5008 bytes
SHA-256: 740b4e72fe29b49b0a72ccdeedf43a782e4f1869c79820d458a0a779c793188e
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 10724 bytes
SHA-256: a9315aedf83c9410dfb8e0b396d6428a2aacf291f44ee06f49eca55fce6f29dc