Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e444fd5f413033…

MALICIOUS

PDF

85.2 KB Created: 2021-03-20 01:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2819df717fe0537f487b42b58ffe5da5 SHA-1: 22d28583f90378f70d9f15df589657fb6e5f8bae SHA-256: 73e444fd5f413033bc6addb787d2ef5f3b60c4be2e58fea0a0bc0918bba9a34e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, directing users to various domains. The primary malicious URL, 'https://midufefew.ru/123?utm_term=video+cutter+android+apk', suggests a lure related to downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=video+cutter+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390643/normal_6029f1c537d1a.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/2274376.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/18666443569.pdfIn PDF document text
    • https://cdn.sqhk.co/guludagew/iegiMie/cute_skins_for_roblox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_604a2bbaeef62.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/2536356.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/ii3he6i/x-_plane_flight_simulator_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417648/normal_60000e23c5fea.pdfIn PDF document text
    • https://gavanigo.weebly.com/uploads/1/3/1/3/131380609/d89a25cddbf75e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gupojakami/10519862495.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/31155809546.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/girimonubizibeta.pdfIn PDF document text
    • https://0aa989e7-076c-475f-bc22-fff5ae310860.filesusr.com/ugd/b44be6_8318eedbe0d2404b8823285fd967d7f8.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_03a8d344c7854e2e8f91f5277098de00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zukogi/fusion_360_sheet_metal_unfold.pdfIn PDF document text
    • http://belajuba.epizy.com/construction_employee_evaluation_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 4768 bytes
SHA-256: 0152831311fc9f3787d1e23438ef17105d19435b330e42e803dbb08ca41719f0
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 12132 bytes
SHA-256: 83f0104071e506a979d3394011dab6d0bea43663a3d822ec3f6b7444c0a36c70
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16512 bytes
SHA-256: 620240735f60c3e6c39cb2d3e57e22608437658ebd4a7af51c0881c872cb82d2
font_03_sfnt_off00013996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13996 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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