Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e58276fd3f7f0f…

MALICIOUS

PDF

92.4 KB Created: 2021-03-29 15:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 17d88e14e7b580839891135df86151c3 SHA-1: 9d65ae6c0faf52e3234106de4959443a638147e4 SHA-256: 98e58276fd3f7f0f7b3954ef1f6c3511e6a9766d9bea9cfada89e95c6e066e50
186 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no specific script was extracted, the PDF structure and external links are indicative of a phishing or content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/award?keyword=cancer+de+pulmon+pdf+articulo PDF link annotation
    • https://vevenefokuje.weebly.com/uploads/1/3/0/7/130775565/7062515.pdfIn PDF document text
    • https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/b8bbb.pdfIn PDF document text
    • https://fulodovujigiw.weebly.com/uploads/1/3/4/0/134016909/minedutu_wawiwafo_gakowere_wesewik.pdfIn PDF document text
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/rufefagevudunez-tobebupotadex-ledavujebajepig-mewoxiketi.pdfIn PDF document text
    • https://nutofagefisamav.weebly.com/uploads/1/3/5/9/135992035/gepebefowule_warido_dukaluva_dusekovozenav.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/xazejili_wafejaxoxogu_mademagoze_lotubupavafas.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/lagogabusin_wegux.pdfIn PDF document text
    • http://foxuzopigudomin.22web.org/31832445606.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/kubilabobufif_xojewogoduwun_rifozanizo.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/ccna_3_chapter_1_exam_answers.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/tosevud/nutepafurukab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b8e3ae-a2d1-48bb-a2a0-9d0ffc92c3b2/how_do_i_create_a_training_plan_in_excel.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/88946115039.pdfIn PDF document text
    • http://velefejaforafe.rf.gd/perfect_tense_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/bendigo_health_annual_report.pdfIn PDF document text
    • http://bowelabu.rf.gd/69467333473.pdfIn PDF document text
    • http://pafixorofabeza.epizy.com/whirlpool_duet_error_codes_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbc3849-817f-4b27-aac7-321122a387be/kowakenudisalal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409e5197-4c5a-49d4-b915-aee892739ae8/the_emerald_tablets_of_thoth_download.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/aspiracion_de_secreciones_2017.pdfIn PDF document text
    • http://nevuwomekemetil.rf.gd/novilenajedibis.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_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 5028 bytes
SHA-256: 94998d9ad45f9037bd8e30a70163712ec15723701e528132b50453898117436f
font_01_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 11816 bytes
SHA-256: 6ad59507796cf98534327e6679c977b10cd63f56d8cfcc30481ddf76ca035f5a