Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f84dfa39fdb0d3b…

MALICIOUS

PDF

80.2 KB Created: 2021-04-18 09:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 10d421396a8d4e3d19b351b8793dec16 SHA-1: 582f1a794aa1c82f8749268ef6da47194328d85a SHA-256: 1f84dfa39fdb0d3b74efe80bb65bd3b1569250c594a521d0015dfded55442bab
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 0.9964

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/strik?utm_term=why+is+my+carbon+monoxide+detector+beeping+twice PDF link annotation
    • https://cdn.sqhk.co/zupodejadofe/hHigmeK/zixibutadilili.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/25776231563.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/egeiaCd/41261140195.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/ajdijig/subway_cat_escape_kitty_run_road.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/ielts_reading_test_2020_with_answers.pdfIn PDF document text
    • http://matodobotosirom.66ghz.com/audible_app_android.pdfIn PDF document text
    • http://tisejamebip.sportsontheweb.net/barcode_types.pdfIn PDF document text
    • http://bigakeka.iblogger.org/nawufuxefijixor.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/gcbqNgj/73668663424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_7d44bf82e950406f9dad1298830fbccc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/nagukuvezixokikirakotax.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_f7d5992c3ca54b069a278dd8e8a44a92.pdf?index=trueIn PDF document text
    • http://poxelisenaxoxig.epizy.com/33344478399.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_ee154f1b478c4feea23a0160515934a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b982cde1-22fd-4254-924d-301b071e3dc6/double_pipe_heat_exchanger_design_calculation_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/beverage_cost_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/73779254473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9b5e4c-7969-4b2c-9fcd-19a9aba066b4/14839473615.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_afdafc330cb640ab8c36b8cf4427e1e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae6058d-1345-4bc5-81e2-5f7903bcb161/2005_chevy_silverado_service_4wd_light.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/toma_de_baciloscopia.pdfIn PDF document text
    • http://fidalanono.myartsonline.com/wageko.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/bac_international_maroc_cours_svt.pdfIn PDF document text
    • http://wuwemeno.rf.gd/kudetewatuwetule.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_ccec11b9af7b486291fded1aabfc7568.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43dd0d25-048f-4a5f-890f-780bfb994029/13682284550.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_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 5868 bytes
SHA-256: 3dd1d8521114004ce7fbfce316c201844b00a6a2431baf5ad36ab4c407569061
font_01_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 11188 bytes
SHA-256: 6cdef9536412290190cc60a6f76149ac76ef1bddf238af3f08056cc82f026083