Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c8f5a3941af628…

MALICIOUS

PDF

163.1 KB Created: 2021-03-29 17:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5962653f6dabd15c1b90ffd9c193bed1 SHA-1: b87f30a12e113b42da5b24c121be18b2d53edbca SHA-256: d4c8f5a3941af6287914f813004a013fd2b4eda928ba3dfcadf671b63026fd17
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified as a link farm on disposable hosting. The document body, though partially obfuscated, contains text related to a sensitive query ('Were babies born deformed from chernobyl'), suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=were+babies+born+deformed+from+chernobyl PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5fcf516462e2c.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/690698.pdfIn PDF document text
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/defofag-paxetegunofajex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fd126782b32b.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/kotofax_vizaz_zodezabeweb_nuwopud.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/jefikik-rukim-zuliwijuxus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5ff20e23c6785.pdfIn PDF document text
    • http://saxefitipar.iblogger.org/47043268038.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/vototunizanaxisane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fcf471630b03.pdfIn PDF document text
    • http://jofosisajagov.iblogger.org/petty_cash_reimbursement_form_template.pdfIn PDF document text
    • http://sofuwabafa.iblogger.org/sources_of_nitrogen_dioxide_pollution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_602b22cb6e272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/celulas_caliciformes_del_intestino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7b4e31-09ba-4b5c-b243-84d6f3614bb6/piano_sheet_music_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e1d9a3-e8af-403f-8cdf-e936230e005d/nabusoxozamizok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823959c7-65f1-4c80-9d5a-dc36f0c77d9d/what_to_put_on_resume_for_customer_service_representative.pdfIn PDF document text
    • http://wexalaz.epizy.com/article_370_in_english_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/are_marantz_receivers_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671e3c38-705d-48e6-832e-2e13055906fa/fifty_easy_classical_guitar_pieces.pdfIn PDF document text
    • http://pifujisebakiju.epizy.com/budepafasuxowulo.pdfIn PDF document text
    • http://xorabaza.rf.gd/29856269040.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/foxitunidemuzojirakotazom.pdfIn PDF document text
    • http://xibezesod.epizy.com/14076615843.pdfIn PDF document text
    • http://wifotuzo.rf.gd/esquema_metodolgico_de_la_investigacion.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000229cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229CD 5516 bytes
SHA-256: 5e46e84abfc0a6dea435a743afc6fd801878c6a5d1ad5570c189d5bdb84585d7
font_01_sfnt_off00023c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C77 14008 bytes
SHA-256: c360988efa4825432d91112745586cde7c12b4531ab2c63e561e25edc986d320
font_02_sfnt_off000268c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268C4 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7