Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c1c90b6c03045…

MALICIOUS

PDF

81.0 KB Created: 2021-03-22 15:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5ed3f7a3ba2bed9fcb52c99dcbd482c SHA-1: 97358768e778f5fb7c761e0bb869fa7a01a43001 SHA-256: c58c1c90b6c03045fd7f08d1e421049d51af97a41ab5c70fe10b98023d7aa47e
74 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a lure for an 'income tax calculator'. The ML classifier strongly flagged this PDF as malicious, and the heuristic analysis indicates it functions as a link farm on disposable hosting. While no scripts were directly extracted, the presence of multiple external URIs suggests the document is designed to redirect the user to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/123?utm_term=income+tax+calculator+excel+sheet+2019 PDF link annotation
    • http://gasurorir.sportsontheweb.net/what_order_should_i_read_the_expanse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5fef9196c7a20.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/gugdyii/hockey_goalie_stick_size_chart.pdfIn PDF document text
    • http://site-shop.xyz/best_sheets_for_hot_sleepers_targetew33f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_603b5dcf31073.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/ahbK9aN/89758615222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fc5bd18087e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_601a3a0660358.pdfIn PDF document text
    • https://cdn.sqhk.co/pixefavenar/fgijchp/72470884699.pdfIn PDF document text
    • http://batmbatm.ru/fapedaniratojuxatezusanmfihi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5ffce51dbb172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_5fd6cf0c766f5.pdfIn PDF document text
    • http://shoppingyxplus.xyz/dewalt_cordless_drill_18v_pricepm327.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/siseji.pdfIn PDF document text
    • http://changely.club/xetizilefifjvt07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_4a84e6b9f390437a8b5f8c44075519df.pdf?index=trueIn PDF document text
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_6f633c307d5e4b1f9f65de8a2519919a.pdf?index=trueIn PDF document text
    • http://jitawidavez.atwebpages.com/little_fires_everywhere_book_ending_vs_series.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_9a4785e6386248a7aa5cced9a56a8385.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_336792cc36c34c62b2613c1b86261f6c.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5360 bytes
SHA-256: ed3588454d8a2aa5ec6c9c271f6cdd9d411cd03ed9b7b4bd9207af5fafddebbe
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10920 bytes
SHA-256: 94724a2c76cc5a406f63130e8605daee301ca593e5859674b9f7147f2cba9efa
font_02_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34