Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c3040582e2dff0…

MALICIOUS

PDF

73.8 KB Created: 2021-03-01 03:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a41b6c1fa4a27ec12d75a5e8110c719 SHA-1: 987aed723b5bfd3537e0a69e81b24322d6613ddd SHA-256: a8c3040582e2dff03da6b105849d76bdbde0cae4eaf0da8aa08870497740ac58
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=linkin+park+burn+it+down+mp4+download In PDF document text
    • http://zegererevez.medianewsonline.com/pedujiva.pdfIn PDF document text
    • https://xegugunozom.weebly.com/uploads/1/3/1/4/131482992/vaxal_zolupezamu.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/icGidgj/given_two_points_write_in_slope_intercept_form.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/ShaWp42/fajatuludakazojog.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/wofiripuzolazumatazep.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/xexibe.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/T5lhd2B/w3schools_java_array.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/chi4GBZ/ninja_fighter_pictures.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/diratotegore-zosuw-sowujexapule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wutejaxevewef.myartsonline.com/how_to_look_up_street_view.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/tawunirakimewepabubid.pdfIn PDF document text
    • http://titasukutisun.epizy.com/64017740609.pdfIn PDF document text
    • http://delomubabobuzu.epizy.com/woxasapipisameratesurodaz.pdfIn PDF document text
    • http://nuvipapijulabu.epizy.com/new_bottle_feeding_guidelines.pdfIn PDF document text
    • http://kigajorujotek.rf.gd/algebra_equations_with_fractions_worksheets.pdfIn PDF document text
    • http://boribasumagit.epizy.com/amphoteric_surfactants.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 5016 bytes
SHA-256: 4f8ec4ed8fcf55a726766d2ca16a3addb83c925fce5a4555b1ac81c63b0b67bd
font_01_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 10340 bytes
SHA-256: ea00b15d193efb0680fd23f8844e58736e5b5744ecff1328f465cd8f7a3aca09
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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