Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b52b5a45da321b…

MALICIOUS

PDF

67.1 KB Created: 2021-03-24 02:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 16abf1910819c161588a9ed59c27d62a SHA-1: 4e7496575fadecd968fddcb44847581ebaf2bc9d SHA-256: e4b52b5a45da321b701c0f4d1aa0f96204b97c1febad21f1551696f13a8d1ca7
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the document's structure and embedded links suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=citra+mii+maker+app PDF link annotation
    • https://rudetotupolukoj.weebly.com/uploads/1/3/2/6/132681245/9992598.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/acting_out_culture_3rd_edition_free_download.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/isis_unveiled_madame_blavatsky.pdfIn PDF document text
    • https://damenuxorofupob.weebly.com/uploads/1/3/4/7/134711178/liwijubani.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/11948138986.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/vhckgi8/christmas_santa_run_london.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/samsung_xpress_m2875fw_replace_new_imaging_unit.pdfIn PDF document text
    • https://kesaroxet.weebly.com/uploads/1/3/0/7/130775747/dijejuvusin.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/6781225461.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/physiology_books_for_mbbs.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/digEOii/50884075054.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/chejjhh/foval.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/8038254015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_3fa54748b6f748b5b58945f9bfdc5243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cea1ddc-bcbb-49c6-ae29-ebca4ca1ca19/nukin.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_0db930343cd24712adcbaf1d0e5b6c30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44d202f-f3d6-4500-94a7-109ed59147ee/73363854881.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_9012745b94c945d4b8ca9e45a1ca5045.pdf?index=trueIn PDF document text
    • http://xijewixevav.onlinewebshop.net/22887266550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e9c875-155f-4ac0-b796-70ee26a959ac/83650382633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b080735-3da3-4793-afd9-1bcdab3be26d/sonic_blue_coconut_slush_calories_medium.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_4260bb1e09d8454185917048437c2479.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10022300-b52b-41fc-a023-9b766536e3b8/maytag_maxima_washer_error_codes_f01_e02.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_off0000cc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC49 4724 bytes
SHA-256: 7021442f1471c61662fa58ea9be4a4a6aa1cc12c11509eea26165219220b5f78
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10512 bytes
SHA-256: ee5c0fa637424747d8b5a6afc140ab64f67a4b3678731d455e4010c0f8a61f07

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