Malicious PDF — malware analysis report

Static analysis result for SHA-256 993b42110d4c301b…

MALICIOUS

PDF

79.3 KB Created: 2021-04-05 11:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: da2464a082177fcd026312f13a8a7dcd SHA-1: 6613b0e7fbe2c7dbac1272c92c6a64349403ddb7 SHA-256: 993b42110d4c301bace0fa0d366afaccf636703058bb1217bf3db2d34188d8f9
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious, exhibiting characteristics of a phishing attempt. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'resalured.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, further suggesting malicious intent. The ML classifier and ClamAV detection strongly support its malicious nature.

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://resalured.ru/123?utm_term=baseball+jersey+template+printable PDF link annotation
    • https://cdn.sqhk.co/tavaxikanabu/jdqjigj/robots_warehouse_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/heR3AuX/pc_builder_simulator_3dmark_score.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/38166514568.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/qNZH4jh/grayland_lite_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/Ciafha6/44861258900.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/baucis_and_philemon_story.pdfIn PDF document text
    • https://cdn.sqhk.co/xufuwejaxe/io8Sjaf/17226177936.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/e78jgkP/download_deer_hunter_classic_pc.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/7372139643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_bf5a99d77c3e48c4b80d20c7db43c9a6.pdf?index=trueIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_15829bd4fcfb43c1b1c46c4a7ce583e0.pdf?index=trueIn PDF document text
    • http://lugenizuridaj.atwebpages.com/vabenelerul.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_d5d5ee6167874f3e8ac73b3254cc4358.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_6836bd60c25a4c4cbe34be32387b4540.pdf?index=trueIn PDF document text
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_891151a11d7e4603813c38b31349808a.pdf?index=trueIn PDF document text
    • http://zorikeroz.onlinewebshop.net/palujuwunuzun.pdfIn PDF document text
    • https://a21785f5-e352-4c0e-a7c3-a232dca3c625.filesusr.com/ugd/3283b0_09f98f9676c24a39a44f1a4a6656c4e7.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_9567f94c149c4fa78f3edc9f8e54ca07.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/how_does_text_structure_impact_meaning.pdfIn PDF document text
    • https://94e55d9a-ad7c-4b6b-a54a-a00202ad3087.filesusr.com/ugd/208fd7_aedc7d56a6bb44f0866554c631125e22.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 5332 bytes
SHA-256: 0a620a54ead04873367afd7e92def12b38b6f939689b1999b36f07941d75e148
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 11012 bytes
SHA-256: 6b881cc7576f129b836c2e3ffb8b0e1f61777732065296d2167171415da7f068
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c