Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bbd8845a446e02…

MALICIOUS

PDF

78.3 KB Created: 2021-03-05 02:32:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b4d45dfb350cea888fd5b9387bfdf68 SHA-1: 3a22ce3b3fec6f95a57756b24f2c353f81e67bbe SHA-256: 45bbd8845a446e02c2d5feed3e7ba1b7a6d363fbf3b4c1059207f82263ade6e9
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this. No scripts were extracted from this sample, limiting the analysis of specific malicious behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://nipisod.ru/wix?keyword=gta+san+apk+data+mod PDF link annotation
    • http://peromopativej.mypressonline.com/hp_laserjet_p1606dn_change_ink.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/vesakixaletagusafupikif.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/my_kindle_is_not_charging_properly.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/60902038606.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/tj8zihO/44165711262.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/pc_das_english_grammar_book_free_download.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/e5_vs_960.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/ge6Sjbh/87835208186.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/ib9c68l/kipipojekolurazexiverez.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/bjhicig/46371055384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogalibamadom.myartsonline.com/gisegifivol.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/mofobosebuzuzel.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_b8a9d82ad2e54c5d9573e7a3674aa580.pdf?index=trueIn PDF document text
    • http://kegigija.atwebpages.com/how_long_can_i_leave_splat_bleach_in_my_hair.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_f5bae572fbb941e094602314c2521c6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbff12d-2135-4b1b-bb01-59bffadc4590/minurekusajiwusorej.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_f9040850de134a79a9dd5545fe454b8c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1668c93d-c0e9-4a3b-907b-48fcb1660efe/moon_river_pizza_fernandina_beach_florida.pdfIn PDF document text
    • http://pujumek.myartsonline.com/69378247808.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF820 5072 bytes
SHA-256: c8e14f9ad6cf13fb3584fa1847587dc1d988ca41537160c996a62c1c955f18b6
font_01_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 10300 bytes
SHA-256: 4e0b9bf5235f1d083cea0892b95e20b0f834e5fc0526a77e98d7cadcfe8e6b96

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