Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81005547ac6609a…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 20:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 57faa4411f758bbadbb8a93f67ef630a SHA-1: 99b2957ea2db2139525073547e5d8f5ae587d173 SHA-256: a81005547ac6609aabf6edb3249b821488e1c9aa68b786d102e72eef1e6ad66c
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, possibly disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/award?keyword=center+of+mass+momentum+impulse+and+collisions+pdf PDF link annotation
    • https://cdn.sqhk.co/dikapagoloza/Lbih3e3/36007672429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_6027220825226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fc707521297d.pdfIn PDF document text
    • https://cdn.sqhk.co/zusegekum/Rsiehj3/guardians_of_ancora_song.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/iigciiI/chores_in_this_house_cardi_b.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/33311344026.pdfIn PDF document text
    • http://zitirisiz.mywebcommunity.org/pirinajoguxowiga.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/lejexafenuvopejulaxowig.pdfIn PDF document text
    • http://lalomazufoza.iblogger.org/31610747659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5fd7f5edcc055.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/hbifPjf/super_oscars_la_mesa_ca.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/anarchy_workout_abs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_8a49276c29c4441b9cb5f309b8a8d559.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_6c780dff741240e58a9cac5ad8f6ba40.pdf?index=trueIn PDF document text
    • http://kenunapovogeto.epizy.com/gold_guidelines_2019_copd_exacerbation.pdfIn PDF document text
    • http://magakawigola.epizy.com/13508922450.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/83943201678.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_cc0db96abfc6450a8e1caf9d5f758dba.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_25b4a8ca92e6430586751c9632abd361.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_0359611a387c4d6ebbf3dc80a643418a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 5208 bytes
SHA-256: a22fd878fe82cea82dd14e379f4163fc4ea9f081e017200bcdb7195071388a25
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 11572 bytes
SHA-256: 7b985a8b715ccd2b7d69abeedccfae4ff62d1fa640498b4d5e8593581278cd25

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