Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5b1e1c9786bb65…

MALICIOUS

PDF

76.8 KB Created: 2021-04-02 08:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 583c8548532563dde20796ed4e038092 SHA-1: 68a3e2e907036ccb707d17ac387115e9b8176098 SHA-256: 8d5b1e1c9786bb654496606db86940554827ad6e819186da5f994efddee11cf6
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to disposable domains. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution. The presence of multiple links to potentially malicious or disposable hosting services indicates an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=adjective+adverb+clauses+worksheet+with+answers+pdf PDF link annotation
    • http://fivibimotuwar.22web.org/4505584934.pdfIn PDF document text
    • http://forkidsshop.online/are_cannon_gun_safes_any_goodm3gbe.pdfIn PDF document text
    • http://itclick.info/213907005141m1ws.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/HLibhcp/jivaxowif.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/bosaranilituje-firusubeloxelaw.pdfIn PDF document text
    • http://vodaxuf.iblogger.org/vitisolunuxavemasazad.pdfIn PDF document text
    • http://snt-br.ru/ruzidupopuxmzhq.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/baletimusutabov-kulamid-dokele-damepazagal.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/5650438.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/iitNZ3V/8_ball_pool_hack_2020_dinheiro_infinito.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/fheiijg/tornado_siren_sound_effect_10_hours.pdfIn PDF document text
    • http://ontrade.top/the_trial_kafkam1f91.pdfIn PDF document text
    • http://wozasewu.22web.org/xigamunaribagav.pdfIn PDF document text
    • http://goodshopsales.xyz/construction_project_kickoff_meeting_agenda_templateu0co5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusujijotajirun.epizy.com/lotogekivejigilulot.pdfIn PDF document text
    • http://difezazimo.rf.gd/alkalinity_of_water_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/10458359007.pdfIn PDF document text
    • http://bodiluduf.rf.gd/akhil_a_movie_songs.pdfIn PDF document text
    • http://xatudoxi.epizy.com/lolujamulezamunepomik.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/49239485286.pdfIn PDF document text
    • http://xemozaso.rf.gd/cedrela_odorata.pdfIn PDF document text
    • http://gifesikubelazu.epizy.com/70731922455.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/tetutalojako.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5664 bytes
SHA-256: a155ac91347005ca2741dadd4c2c9bda7e6c035ad42475ee9dd17d2a985ae4a3
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 12352 bytes
SHA-256: 094520e19b1f58f27df6029634928c434de481f6bad3664c3a148a4032e59c9f

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