Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f295a674f3a44d…

MALICIOUS

PDF

96.5 KB Created: 2021-03-29 13:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3205c3cccb6c8d82be6958eeaa415d3 SHA-1: 6c6531f7f98ce8bfbee3b9c92964512202cfeb12 SHA-256: f4f295a674f3a44d43b275f4906741ba724db79c51a69119f1b38a9fc7d76d7a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing lure. The PDF's structure and embedded content suggest it's designed to trick users into visiting this external site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=doublemint+ad+song
    • http://xinupavob.iblogger.org/35067549281.pdf
    • https://cdn-cms.f-static.net/uploads/4531626/normal_602888086a62d.pdf
    • https://cdn-cms.f-static.net/uploads/4388626/normal_60530b046119e.pdf
    • http://sibatike.getenjoyment.net/zifafibizuniwuvitilas.pdf
    • http://xexapitanegis.getenjoyment.net/zitexo.pdf
    • http://ninomut.sportsontheweb.net/kickboxing_fitness_program.pdf
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/2c36ee.pdf
    • http://kubosikavudux.mygamesonline.org/steve_jobs_quotes_death_bed.pdf
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/68eee0d1.pdf
    • http://nebibila.iblogger.org/22661595286.pdf
    • http://xazupadapafow.mypressonline.com/portrait_drawing_tutorial.pdf
    • http://xubanapirobula.mypressonline.com/notukazefesixiwap.pdf
    • http://vuwomodema.22web.org/60647180170.pdf
    • http://kozidozilujivox.getenjoyment.net/jiruwiledaza.pdf
    • https://fofopozisiwel.weebly.com/uploads/1/3/2/6/132696178/7089541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudufigunabi/22167510705.pdf
    • http://duwemanuwixam.atwebpages.com/xerox_7855_drum_cartridge_reset.pdf
    • http://buremoxosolubu.epizy.com/30931125485.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/azzurri_legends_germania_formazioni.pdf
    • https://s3.amazonaws.com/baposivarabuj/auditor_general_act.pdf
    • http://zakexukosogu.atwebpages.com/fulivamiraz.pdf
    • http://fataragoreb.myartsonline.com/optiplex_7010_driver_cab_windows_7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123e7.bin
4dd52252fbb4849617d964dec4403014bc91c4744f776024bf37bdfa6fa1cd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 5188 bytes
font_01_sfnt_off00013577.bin
baa45e2a81627de4b789ed056a599d7e1e1daebf3025d07df3b860f090b0123c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13577 11968 bytes
font_02_sfnt_off00015e5e.bin
d87d1747d4f8eddc0495f5def6875e09bd5844f6416e2426598bf9f1b2a9cfac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5E 16264 bytes

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