Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce9b7d1aca21b26…

MALICIOUS

PDF

69.5 KB Created: 2021-02-04 06:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 86cb5f9500ee583a0dec4a5d28c310d4 SHA-1: 09e5ca217af68d99247894e96c685fa2c7a4af9e SHA-256: 6ce9b7d1aca21b26398d2e469e87bfa95ecea094632dc0f363acbf9034175d0e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file exhibits characteristics of a malicious redirector, with multiple embedded links pointing to disposable domains. Heuristics indicate these links are part of a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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 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/aws?utm_term=chuunibyou+season+2 In PDF document text
    • http://everydayy.fun/gazesa11rc7.pdfIn PDF document text
    • http://front-glass.website/684516518127q857.pdfIn PDF document text
    • http://legko.travel/pelikinemedugjfyu.pdfIn PDF document text
    • http://mazers.fun/97168190230jfjln.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/girlfriends_guide_to_divorce_finale_explained.pdfIn PDF document text
    • http://badgesverified.com/lego_ninjago_sets_dragon_s_forge6v9g7.pdfIn PDF document text
    • http://genusttwsr.fun/camus_the_myth_of_sisyphusxj4ep.pdfIn PDF document text
    • http://ptmonline.ru/flutter_bottom_sheet_github296l0.pdfIn PDF document text
    • http://foyou.store/formula_para_calcular_perdidas_insenlhby5.pdfIn PDF document text
    • http://magicwoolshop.com/angry_cartoon_cat_craft_escape_mapsoijpx.pdfIn PDF document text
    • http://francobusiness.com/minecraft_exploded_builds_medieval_fortress_downloadigw9n.pdfIn PDF document text
    • http://betmoy57.com/puburobojalapivnaonl.pdfIn PDF document text
    • http://zawugexoj.22web.org/audit_report_of_infosys_company_2018-_19.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/gupojakami/23806154469.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/banjo_movie_song_wapking.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/zasaxaxolu.pdfIn PDF document text
    • http://xamilelamijokuk.rf.gd/82388059321.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/91665178723.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_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 4924 bytes
SHA-256: b9a455c9447cc9dd181db70b11ac202ae53c61b71e96149c05cfd2220a4549d5
font_01_sfnt_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 10744 bytes
SHA-256: 4edf90ed976636b58a142262493c0e266a67f5b6de93f15340815d111f1aa5d9