Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6324d32229eb15…

MALICIOUS

PDF

81.4 KB Created: 2021-03-09 19:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2abec92a4d63c56fa05141d3b6576a3 SHA-1: 76d2085f972feeeb24dbc0de96c7418fa144ad10 SHA-256: 0b6324d32229eb1566d80a94def7a76c34fbc725d6ccf96261e008292c319c1c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=android+video+maker+app
    • http://theboldpantsproject.com/57604036981u1tuv.pdf
    • https://cdn-cms.f-static.net/uploads/4479240/normal_60214764cf013.pdf
    • http://ferunasivagu.iblogger.org/weledefufix.pdf
    • http://hallop.xyz/24871935184xiyeo.pdf
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5fed9ed9e8f00.pdf
    • http://olymp-trade.top/49629078091u7gly.pdf
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fff3c41b8b68.pdf
    • http://spencermcman.us/jipevodarjmcam.pdf
    • http://nepifumawal.22web.org/42485795483.pdf
    • http://yoptan.space/12057245701m1mli.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_6039c219b518c.pdf
    • http://dezunanerab.iblogger.org/56269479204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vabedafozo/razedizesigirelegoni.pdf
    • http://baxamudixilado.rf.gd/geometric_mean_maze_worksheet.pdf
    • https://s3.amazonaws.com/fogibi/sex_and_the_city_2008_ending.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_d78fd9bcc7fb465e8a44072af68f59d0.pdf?index=true
    • http://sasomibaben.rf.gd/cuanto_es_un_8_pies_en_metros.pdf
    • http://batitesejikak.epizy.com/93783884014.pdf
    • https://34be1bd7-16d8-4748-a805-857658c434e5.filesusr.com/ugd/2d797c_ac58e07d15144e86bd5dde42a97616fb.pdf?index=true
    • https://s3.amazonaws.com/tesotiwapax/81969182820.pdf
    • http://jodetiwozefiso.epizy.com/plantar_fasciitis_ultrasound_guided_injection.pdf
    • https://s3.amazonaws.com/lakadutof/35053673836.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101de.bin
f9ed711e67fcb70f6bfa0ba28fbee7d65d3921ccad7b3a4317de99a8451070b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 5008 bytes
font_01_sfnt_off000112d8.bin
97215046b00ba28a303b527a245ae8aa706ac01bb061470c1512d319342d318c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 10896 bytes

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