Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aec1d9ae59f158…

MALICIOUS

PDF

82.3 KB Created: 2021-02-17 10:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c1b02f3d210f5bb410c8bae05fc3b310 SHA-1: ab569cca53327394feeee01e76f34ee0c000e839 SHA-256: c4aec1d9ae59f158b1c8abac2960c5d60c46b1eb70ebfb8a7135550dbe2a67b1
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a 'Focusrite Scarlett 6i6 manual'. The presence of numerous embedded URLs, including one pointing to 'bologen.ru', indicates a likely attempt to redirect users to malicious sites for phishing or further payload delivery.

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://bologen.ru/wix?keyword=focusrite+scarlett+6i6+manual PDF link annotation
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/2082324.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadurip/eUicgiU/fitamotimo.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/pijowagarixariruz.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/AuHFibc/truth_or_dare_questions_for_your_boyfriend.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/ladudajedoboni.pdfIn PDF document text
    • https://cdn.sqhk.co/mitugejaxel/4llk2kp/fortress_under_siege_hd_mod_apk.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/purikikax_vadatetexedoriz_tasozu_rurufitixi.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/firoleka.pdfIn PDF document text
    • http://kubodir.22web.org/47341125651.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/3TLWxkc/31798814698.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/1Nhh6Jt/bupaparipe.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/batoragubukepo/cantigas_de_amigo_caracteristicas_formais.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/bal_ganesh_hd_pic.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/holy_bible_for_java.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/sales_incentive_calculation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/ruberepirufowiro.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_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 5052 bytes
SHA-256: e3c6896e7c4532cd0bf1647eb9d12c1ad8497c21e4881b42eb8891dbcaf9ab5b
font_01_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 10684 bytes
SHA-256: 225e39a7906670a3f85f38c2708c67ed29b49801592f5ae8398d050332327c86

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