Malicious PDF — malware analysis report

Static analysis result for SHA-256 82390e0f613a7900…

MALICIOUS

PDF

77.0 KB Created: 2021-05-10 03:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17e2c2f1ee7394060a79577e38af703e SHA-1: 96df036b060a696db127862efb8c1a5dfc423862 SHA-256: 82390e0f613a79007d0f187c555a09835571f5f1beec72b570bd10380a69dff2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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://crophysi.ru/strik?utm_term=how+do+you+do+a+presentation+for+an+interview PDF link annotation
    • http://nelilovodik.scienceontheweb.net/dan_abnett_eisenhorn.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/how_do_you_write_a_mla_research_paper6x43g.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/ferozsons_urdu_encyclopedia_free_download.pdfIn PDF document text
    • http://snegny.com/how_to_improve_freestyle_rap4h4m8.pdfIn PDF document text
    • https://cdn.sqhk.co/matapolid/0hihYhb/lanka_walltiles_plc_annual_report_2013.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/Ghf0ztm/mediamonkey_gold_4._1._25_key.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/021645f56e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/UH1SUge/cash_book_example_format.pdfIn PDF document text
    • https://wegoboxup.weebly.com/uploads/1/3/4/7/134772399/6bbee6.pdfIn PDF document text
    • https://cdn.sqhk.co/wokowuvawuz/ghjiUja/relaxing_music_2020_app.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/domofode.pdfIn PDF document text
    • http://nipijimosobolem.mypressonline.com/words_with_short_vowel_sounds.pdfIn PDF document text
    • http://teenagetutor.net/97059779372m2ki3.pdfIn PDF document text
    • https://buzotifosu.weebly.com/uploads/1/3/2/6/132695554/wimitasajo_dejodariwuben_bujetogu.pdfIn PDF document text
    • http://maddot.space/gajemutobamidufopozotixeb302t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebomotixot.myartsonline.com/kesasugewonewimilati.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/pagajikazogafad.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/american_english_file_starter.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/behold_the_dreamers_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/probability_and_statistical_inference_9th_edition_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/bobebupuvalobezowowosalo.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/63118014793.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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 5216 bytes
SHA-256: c249c33cb702cbc30c8f79fe95beb9fedd16097a2b40bac8df31752bfe011e3c
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10652 bytes
SHA-256: 4569107888c1929c3099bccde1a00c926b9faf9fb9305353845a91ff044f934e

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