Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ee8afcd6102bb2…

MALICIOUS

PDF

72.2 KB Created: 2021-03-12 11:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f74234c5fec7dccb43564a980ea226d9 SHA-1: 2077cfaa6df0234aac8df93d7f19aca81b9cd6d7 SHA-256: e1ee8afcd6102bb276b50ec7477edbf01ee6683ce0e7778a5bb143e7d6e970d1
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to trick users into downloading malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to delivering a payload via one of the embedded links.

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://vilenefex.ru/123?utm_term=acer+aspire+f5-+573g-+566f+driver PDF link annotation
    • http://teren.fun/inverse_trig_functions_quadrant_restrictionswdtx4.pdfIn PDF document text
    • http://madewithsunshine.com/diablo_2_cheats_1.14_d98jso.pdfIn PDF document text
    • http://nimojojisox.22web.org/pukesabupexodajovo.pdfIn PDF document text
    • https://belukuxar.weebly.com/uploads/1/3/5/3/135312366/ee3506231cae.pdfIn PDF document text
    • http://nesobaka7.xyz/maybe_yiruma_piano_sheetfblao.pdfIn PDF document text
    • http://idealslimitaly-official.site/goxowofonoporanikusawi46qew.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/bopemapek-bedujateri-getovorowu.pdfIn PDF document text
    • http://zuvels.xyz/599056418355nkfz.pdfIn PDF document text
    • http://erogan-columbia.site/asus_rt-ac85mr_ac2600_router_reviewdhrbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c05a394-1939-4547-b562-b4fda8216dcd/how_to_purchase_shares_in_singapore.pdfIn PDF document text
    • http://kajurilin.rf.gd/navodakusevixakan.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/necchi_sewing_machine_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/xokosonunaviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24123100-0d50-43df-82e3-45e59b06fc32/flat_world_map_outline_vector.pdfIn PDF document text
    • http://pidifuwamofuw.epizy.com/dikonuvimiboxudilososopo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/what_kind_of_ink_does_hp_4500_use.pdfIn PDF document text
    • http://pajimej.epizy.com/boca_de_pescado_en_tuberia.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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 5896 bytes
SHA-256: 7e5bb40b9f7aa4d9ec4692f4e84ba838f7ccc3c4b5efad9a2c4a7a8bc61b468a
font_01_sfnt_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 12264 bytes
SHA-256: ac07ca4af480f831a27392b1f982862b9b9c5a881e052ae02ef7036ebcb87734

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