Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3be47ac26ea94f…

MALICIOUS

PDF

81.6 KB Created: 2021-05-08 10:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1eb8bfac7d611fed3275d24764e80a8 SHA-1: 7121df8f5f850e3a374b9dc07e5fb8ba864a5493 SHA-256: ec3be47ac26ea94f2ba8642f5f5c9f148ee9874e182cb21eb5410e01a13367d4
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+good+is+gathering+storm+lol PDF link annotation
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/pemibowaz-petujibojuxebiw-sojegusali-bunulolanotadad.pdfIn PDF document text
    • http://coolstudent.space/lowoxex7dnf6.pdfIn PDF document text
    • https://konatewed.weebly.com/uploads/1/3/4/6/134692195/belivifaga.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/8jgumgd/tewefokidifalos.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/fidexizavibolajeri.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/jii3aiA/lagikiwazonuregujapowafed.pdfIn PDF document text
    • https://molawaxurot.weebly.com/uploads/1/3/4/6/134699933/tomos.pdfIn PDF document text
    • http://istra-backwater.ru/56833844080k0ifv.pdfIn PDF document text
    • http://chaptejvxz.fun/federal_supreme_court_cassation_decision_volume_20lzft6.pdfIn PDF document text
    • http://logoped-samara.ru/56281075852xa6qo.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/Bxjicjb/pase_elite_gratis_free_fire_2019.pdfIn PDF document text
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/lunumoripale.pdfIn PDF document text
    • http://remontnatali.ru/arctic_king_8_000_btu_portable_air_conditioner_reviewsx4kap.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/HoLt9ja/wood_cutter_game_download_for_pc.pdfIn PDF document text
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/2262754.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/634d707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_7740ef573f9742f88684cc9ed3bf0d05.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_aa5b6c43e1a94d13b5195d925e1aa2e5.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_f75dbbaae9c1467daf422c92f8ea26d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/python_online_training_course_hyderabad.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/abrahaminte_santhathikal_songs_320kbps.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_b89b3f4cb9f94804abd0172e0dbbdf70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/mejores_frases_de_el_monje_que_vendio_su_ferrari.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/jezatikigefuzapekoxin.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/36862579208.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_b1c01f81ae4440179e24016735ed3f9a.pdf?index=trueIn 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_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 5292 bytes
SHA-256: 6c5ce8eaa2cdeb0b37d179ee595d8170bfff6914c2ab37efd22db02e3b3925db
font_01_sfnt_off000112b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B0 11108 bytes
SHA-256: b61b0e6792baaf259b7be580de813ec589129d79b200d7041b2db24c919ab5ea