Malicious PDF — malware analysis report

Static analysis result for SHA-256 90623161289f26d2…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 22:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 87830d73aad296a06e70f4c8832eb669 SHA-1: 2827995bb9cac0d0678de994e2a4982a720a0d14 SHA-256: 90623161289f26d2a290cdd55627a3d21bc8242428bc71d9429d7bf07133e941
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or a mechanism for distributing further malicious content. The document body, though heavily obfuscated, appears to contain keywords related to technical devices, potentially luring users to click on the embedded URLs for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://botokaw.ru/strik?utm_term=tp-link+tl-wr841nd+repeater+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459621/normal_601ba60a13bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448538/normal_602f83db48155.pdfIn PDF document text
    • http://nudevego.iblogger.org/repokuz.pdfIn PDF document text
    • https://cdn.sqhk.co/duwefetufe/gLKHOXX/mobile_manager_app_for_pc.pdfIn PDF document text
    • http://bibavovomid.22web.org/9099104358.pdfIn PDF document text
    • https://nedosadowizo.weebly.com/uploads/1/3/5/3/135347652/mibemutotafe.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/RhbSJR9/mumejemanoviwanupubasuxi.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/dinewebigikiraviw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwosagamivi.myartsonline.com/how_to_install_first_alert_smoke__carbon_monoxide_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/riello_oil_burner_motor_bearings.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/91940143648.pdfIn PDF document text
    • http://gizejofak.epizy.com/ragetorupita.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/gafovikag.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/81885576023.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 3476 bytes
SHA-256: a5566134b36e4e9b1f7259f4d7fe52f69b826dc0120beb019dea0dbc06579113
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 5400 bytes
SHA-256: ef5f356af828227b08c9063385915c1cc80f1f5402866dcf205fbdeca62fe90d
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 10728 bytes
SHA-256: 4faa91790685e4d3657f4fe0cbd54e045f295ffe8f4db67ab1a0dfc48b0cbc3f

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