Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16f2eb6f696430f…

MALICIOUS

PDF

76.5 KB Created: 2021-04-05 09:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b0780c858815ff23fce98677d71cecfb SHA-1: e6c3c5887eee590532d5f9847d413e58f056cc18 SHA-256: a16f2eb6f696430f3142e84d684f644cbc7b82c7e4546529436cd868cd916d35
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/123?utm_term=application+for+experience+certificate+word+format PDF link annotation
    • http://it50discount.pro/256937446782ykhh.pdfIn PDF document text
    • http://firstsecu-paypal.com/fopajurunoluno81f1q.pdfIn PDF document text
    • http://blognews.top/21759121803vf4kx.pdfIn PDF document text
    • http://yognat.space/financial_affidavit_form_florida_child_supportb5cyt.pdfIn PDF document text
    • http://popapirim.22web.org/genetic_engineering_in_humans.pdfIn PDF document text
    • http://gradstroy.su/76390412328k3n37.pdfIn PDF document text
    • https://guzovadolo.weebly.com/uploads/1/3/1/6/131606502/xoxabonag.pdfIn PDF document text
    • http://woodbonus.net/xagijowulalaputesc85i.pdfIn PDF document text
    • http://xefibusutama.22web.org/xaneniditonopu.pdfIn PDF document text
    • http://mazafaka69pussy.online/luhr_jensen_little_chief_smoker_recipesvvwiw.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/eb9b29f5.pdfIn PDF document text
    • http://nofawemew.iblogger.org/46277719946.pdfIn PDF document text
    • http://raifaisentgo.online/marvel_avengers_the_ultimate_character_guidenjo9n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipozuzuwito.rf.gd/how_to_replace_main_tub_bearing_washing_machine.pdfIn PDF document text
    • http://lutolajawaw.rf.gd/paduludot.pdfIn PDF document text
    • http://bebukoruwuru.epizy.com/sotukoxoxafajiviniruje.pdfIn PDF document text
    • http://sifopowi.rf.gd/ccnp_troubleshooting_free_download.pdfIn PDF document text
    • http://wevuwafawa.epizy.com/protege_ontology_tutorial.pdfIn PDF document text
    • http://xezigogologivam.rf.gd/national_business_incubation_association.pdfIn PDF document text
    • http://rawobebisef.epizy.com/vatojabivotisaromegenu.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/glencoe_geometry_chapter_4_test_answers.pdfIn PDF document text
    • http://bopebafelakab.rf.gd/demonirat.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5272 bytes
SHA-256: 417a6fc97d2ddaae0bbb3d155b52170266b2c8f0cc14c37449892b18e5bd5f13
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 11064 bytes
SHA-256: 092aa2a8a1951a55236c88acf87d395ea9140c46c7f1e876c1c68662f9085ad9