Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc2ce81d10666d4…

MALICIOUS

PDF

93.4 KB Created: 2021-03-06 07:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 059dfcd2bc2a4ee4a8802239b6a0898d SHA-1: 4c3052cd2477104f418198450f77788f9c6d7c1b SHA-256: 4fc2ce81d10666d4e7d6cb79fb524b1077af382b679255a0bc1898fac7f64166
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical support or troubleshooting, aiming to trick users into clicking malicious links.

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://vilenefex.ru/123?utm_term=why+is+my+jbl+speaker+not+working PDF link annotation
    • http://rotawafuwuno.scienceontheweb.net/23253629521.pdfIn PDF document text
    • http://trackengine.host/resmed_airsense_10_autoset_how_to_adjust_pressuref1hyk.pdfIn PDF document text
    • http://hamsterbig.com/kowikekogatodewokoppb6zv.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/f580d59dd7067.pdfIn PDF document text
    • http://thehensleys.org/bubiduripafucyrns.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/901487.pdfIn PDF document text
    • http://menetufebev.22web.org/how_tall_is_jaycee_dugard.pdfIn PDF document text
    • http://cafe-cok.ru/timidez_botanicaoimuz.pdfIn PDF document text
    • http://prostotit.site/sufagepenovunbm0.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/probabilidad_y_estadistica_descriptiva2uuhr.pdfIn PDF document text
    • http://auto-agents.space/vowonibeipihi.pdfIn PDF document text
    • http://shothard.site/visual_basic_2008_tutorial_for_beginnersz54ua.pdfIn PDF document text
    • http://ifeelgood.club/ios_11_launcher_for_androiddsc57.pdfIn PDF document text
    • http://polokuvek.iblogger.org/veforivekudutituw.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/matos.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/kegapudupog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buposubugoromot.rf.gd/gimeburugawedujabejilom.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/the_art_of_living_well_and_finding_happiness_taurus.pdfIn PDF document text
    • http://xepadegi.epizy.com/heimerdinger_guide_probuilds.pdfIn PDF document text
    • http://maguzuj.rf.gd/printable_phonics_worksheets_phase_2.pdfIn PDF document text
    • http://zimewukefaja.rf.gd/what_are_some_male_greek_names.pdfIn PDF document text
    • http://sufumawug.epizy.com/vanixorop.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013d62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13D62 24060 bytes
SHA-256: be8261ff755cef7afded70352fe45042fd80ca5c028b5764949759b7287ae3b0
font_00_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 5720 bytes
SHA-256: db69bc2f05e025c6a7a5d247fca8a538c3aeb0cc6a70a6e46a537b5936e72280
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 10716 bytes
SHA-256: e255f4f82e4c4404256fbc8211b0d181bfa8fd5b838ae0eb7d4b130d583d0546

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