Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec22cae64a58fb51…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 17:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 840c51e157df834377a351cdfd62a1fe SHA-1: 1a2fdbb651dd0cd87c0dd78eddbe373a2f8a27b0 SHA-256: ec22cae64a58fb51a7d9ef1352b49dd74979a6aa800204fbfb60c69ef1e75cc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or content distribution network. The presence of external URIs and the overall structure indicate an attempt to manipulate search engine results or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://akrmedia.no/ckfinder/userfiles/files/gorasabog.pdf In PDF document text
    • http://skisun.it/userfiles/files/9112382594.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/15837997759.pdfIn PDF document text
    • https://tmtteks.com/files/jamutumu.pdfIn PDF document text
    • https://keongracun.org/contents/files/11145624444.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202192143295260.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/xijibelaxitutomafi.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/xitalupudufilumegor.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/91514948942.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614860531d784---84403778469.pdfIn PDF document text
    • https://salonrewards.ca/images/file/60590435177.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/79122107706.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/jopenafutusafaxozuxagud.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/83354674953.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/74743183294.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/gufuwosugutuvajerolita.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d11d82df2504d6343a668ed5282b68d0/38552362982.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/lizuwapo.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/kowonow.pdfIn PDF document text
    • https://nexapos.com/upload/files/xorujibozuki.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/zudijokulo.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/37826726298.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/6416831989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vidmate+app+2018+download+installPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 11008 bytes
SHA-256: 72d4d1687707b97bcc57ba9ec362475cabbff8ebf8935649572cbd6deb84a5c4
font_01_sfnt_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 16924 bytes
SHA-256: c5affe8f42d94755657958e14e147d3b73f22bd216df4c4a420a382d120e80b7

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