Malicious PDF — malware analysis report

Static analysis result for SHA-256 575296e5ab4460ee…

MALICIOUS

PDF

80.7 KB Created: 2021-03-31 20:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b62f16af5c7b54cc6fe36352c7dda253 SHA-1: 6a962c3d4166340d4007942843cad2bc4ca1740b SHA-256: 575296e5ab4460ee45e4736fd97b88c38cfa255fb19692eeb12ac157a6105953
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. Heuristics indicate it's a link farm on disposable hosting and a ML classifier flagged it as malicious. ClamAV also detected it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to a 'strategy guide', reinforcing the lure. The presence of external URIs indicates the document's intent to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=checkers+strategy+guide+pdf PDF link annotation
    • http://kovativegapok.getenjoyment.net/venice_italy_city_map.pdfIn PDF document text
    • http://norusezuluwo.iblogger.org/attendance_sheet.pdfIn PDF document text
    • http://votapusi.mypressonline.com/rujesip.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/balugepomunizipimido.pdfIn PDF document text
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/c324f5b545.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/engineering_drawing_tools_price_in_sri_lanka.pdfIn PDF document text
    • https://revasarubon.weebly.com/uploads/1/3/5/2/135295272/fenazafos.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/gemupozivukuxo.pdfIn PDF document text
    • http://kupimaxi.sportsontheweb.net/80906540309.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/54318129687.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/mabutatabelunosijon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newemepakirid.myartsonline.com/samsung_top_load_washing_machine_error_code_ub.pdfIn PDF document text
    • http://vurosija.epizy.com/algoritmo_de_la_division_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/64886055477.pdfIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/college_love_story_movie_south_2020.pdfIn PDF document text
    • http://wetavirevamo.epizy.com/debtor_and_creditor_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/mupirabupipaves.pdfIn PDF document text
    • http://zevusup.atwebpages.com/83672502490.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/vanaspati_vigyan.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_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 5456 bytes
SHA-256: 0232004be91581e56a0fc5dea3f5e5e6e47bf40605463aee98273d861e77fcb1
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 10432 bytes
SHA-256: 1ce08d95a56763f74c216bb16385f3ab81584396dca87a2db1a235c55503c184

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