Malicious PDF — malware analysis report

Static analysis result for SHA-256 8259ae724941639f…

MALICIOUS

PDF

67.5 KB Created: 2021-02-21 11:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d00e12a5f472061d8e636d26e8b81ae0 SHA-1: 07ec6dc6d9de021a74fe6622195f0f13b7f37997 SHA-256: 8259ae724941639fc895bc9ba2e651d9bd5d0977fe49e696d26a9c95a5dd7aa2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics, including ML and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though heavily obfuscated, contains metadata suggesting it's a 'boat crew seamanship manual', a common lure for phishing attacks.

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://leonvi.ru/wix?keyword=boat+crew+seamanship+manual+comdtinst+m16114.5c PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491670/normal_5fe6e46b3b38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_60136a09e708a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fe0181430ed9.pdfIn PDF document text
    • http://verenica.net/football_manager_handheld_2010_psp_cheatsfnt4g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5ffe55469f83a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416802/normal_5fca4dfe51c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_60280c5299dcb.pdfIn PDF document text
    • http://temilops.xyz/me_before_you_bahasa_inggrisfr3ol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6014c42fa81b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_601ab7b57035d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419452/normal_5ffce2676cf62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd7708074b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5fd63ff592404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501961/normal_5ff9386363745.pdfIn PDF document text
    • http://nepufikusugepa.iblogger.org/sulasikawel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwubujuwu.epizy.com/79622548029.pdfIn PDF document text
    • http://fokerek.epizy.com/pomizi.pdfIn PDF document text
    • http://fibajufe.rf.gd/jodif.pdfIn PDF document text
    • http://daduzafez.epizy.com/break_even_analysis_example.pdfIn PDF document text
    • http://fipotunisobojow.epizy.com/71348856074.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_off0000cb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 5904 bytes
SHA-256: 2f0991d30f1d04d591b8b08ff61afddd492f41183343f15a33b3a3b4f991a73a
font_01_sfnt_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 9740 bytes
SHA-256: 86004105ed15dcdf2c743bd46cb7a722d6919567525fa56ed32af4bd2d78e6cb

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