Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2998233c857ab3…

MALICIOUS

PDF

91.7 KB Created: 2021-03-09 05:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 33f2c8b8292c8325da3ab120a71a0e19 SHA-1: a310df592f937f52551be7e20f1a4a869804faa1 SHA-256: 1f2998233c857ab3ef8d8bc587f7a3444bf7205e06fb2eec70b305d083abdce4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristics point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=google+sheets+if+statement+multiple+conditions PDF link annotation
    • http://cmbclientes.com/woxokikexupe1gl8n.pdfIn PDF document text
    • http://jigapenufi.medianewsonline.com/how_to_detect_sleep_apnea_in_babies.pdfIn PDF document text
    • http://xidoxuj.22web.org/insulated_corrugated_metal_roofing_sheets.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/how_long_does_it_take_for_gums_to_heal_after_gum_surgery.pdfIn PDF document text
    • http://wupulij.22web.org/shareholders_loan_account_balance_sheet.pdfIn PDF document text
    • http://stepka2016.xyz/rekizonhaoc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/malaguena_easy_piano_free_sheet_music.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_05c696aed5ea4c4792caceb14726b325.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_c35ea52fa35442e19181af88bbaf6b2f.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_da465dab1f2f41c6a42e392f618f9a9d.pdf?index=trueIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_1524e18861554f4087b4ae7690a0d394.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/18276739129.pdfIn PDF document text
    • http://rowisumemosil.rf.gd/zirabas.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_f9f51e21b7e6425fa5e7a74b626b1cdb.pdf?index=trueIn PDF document text
    • http://tenezozujilajiw.rf.gd/6220095823.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_c54bb827c3b34c09bd820c0f825a371c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/gooners_guide_predictions_today.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_2e440f9a8c9f420c8f5a9f6d4fe62b61.pdf?index=trueIn PDF document text
    • http://mibaruruluket.rf.gd/zivasoze.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/89780933681.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 5504 bytes
SHA-256: c96cba234dc5b2b4980dc5b288068925139d44fd126c886c588e37aefc8d0d5b
font_01_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 11408 bytes
SHA-256: 52d89017518a495f824e63389b11eecb535ba31c03251a0fe743fb27e7954a83
font_02_sfnt_off00014c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C15 16132 bytes
SHA-256: 60f53b17f7925ac1818ac9336ea58fd206fea48872b5377b70e6fb8114080afd

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