Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc69d145917a2c24…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 17:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af310582c5bc6a6d250a31b014af58af SHA-1: c77ba4d38042fce52370ac61a3f031925b49ff4b SHA-256: dc69d145917a2c24c6c2140b26a01975d497dfcc132227ae43c052ec0f658b48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=guess+the+logo+apk PDF link annotation
    • https://elperrocallejero.info/ckfinder/files/rizigujudubonororamez.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/newilujopoguxuwiparirag.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/54166823869.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/58121493305.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/zesovuj.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/59476726722.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/41419305116.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/76860478535.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/regemud.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/79625607943.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/kagamonalu.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/40918803242.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d01b13f13edc1efb4cac14f01dcf4eea/88252135482.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/netaletadewinilewapije.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/16555867524.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/67874275923.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/78707880825.pdfIn PDF document text
    • https://hojoairport.com/images/file/84159222635.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zilogorumasibubutetexuke.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/zowekovegitudatimuk.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supumogofu.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109131428013918.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/zejoxogam.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://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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 19944 bytes
SHA-256: 0f5ffca388e770f133ac67cf957cb05635ec586419f370960c0ee156709286d1
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10468 bytes
SHA-256: 69da7c2b80680774598dad8791e97fd5c32526d306a9ef52f51f44f7dd433641

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