Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c0529dc4a978cc…

MALICIOUS

PDF

102.0 KB Created: 2021-03-11 14:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 33967deea91c73b5140bed1c44c14e92 SHA-1: d8deba408e5a3a2c731455069ea59e23a0865382 SHA-256: 79c0529dc4a978cc841082083f411ea07423e7f479bc42164a15b937f688213c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/aws?utm_term=dragon+ball+manga+chapters+wiki PDF link annotation
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/rafebufepipan.pdfIn PDF document text
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/vovexavijumumo.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/98a136103878.pdfIn PDF document text
    • https://jikomaviwibu.weebly.com/uploads/1/3/4/3/134365837/kubafiforedu.pdfIn PDF document text
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/segarazofibav-likudipo.pdfIn PDF document text
    • http://it50save.info/blade_and_soul_lightning_warden_guideedrlr.pdfIn PDF document text
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/rasowu-kegeramobogo.pdfIn PDF document text
    • http://banki-internetowe.com/plan_y_programa_2011_cuarto_grado_geografia7j1ga.pdfIn PDF document text
    • http://gladkoe-telo.xyz/interstellar_hindi_dubbed_download_ftr2jv.pdfIn PDF document text
    • http://wildboost.club/wadutebovo5rf24.pdfIn PDF document text
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/jifukabuwejep.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/836373.pdfIn PDF document text
    • http://gavewedek.iblogger.org/bs_player_linux.pdfIn PDF document text
    • http://shopee24.site/saguniwoqh.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/8871197.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/mekutoxosi.pdfIn PDF document text
    • http://dorightunion.com/jidiveginifanijoberezq5wph.pdfIn PDF document text
    • http://cg-designer.xyz/fedoxikomorovonusebuzelup6h431.pdfIn PDF document text
    • http://cardioactiveitalia.site/hellrider_2_uptodown42f9t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nibewisule.epizy.com/wireless_communication_system_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/game_blocky_cars_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/worksheets_for_esl_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/numeracy_skills_test_practice_questions_with_answers.pdfIn PDF document text
    • http://pifimat.epizy.com/ocr_b_chemistry_student_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/100_bpm_drum_loop_hip_hop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D8 5432 bytes
SHA-256: 852e357322445a5728b241e2eee5cbb21777b2820d4bfe52154c99a58492f198
font_01_sfnt_off00015624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15624 11400 bytes
SHA-256: 3b8a1d70d338f0bf74ba5f655fb5e18669ace411b9c02eb8dc1a8a1f726e3a14
font_02_sfnt_off00017c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C53 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333