Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba88a00a70add9f3…

MALICIOUS

PDF

71.3 KB Created: 2021-04-29 14:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7d0dd696f63e0242cd4195c2cd1d2ebd SHA-1: d0532904eefec7bd285ed0263d0c8688c6ad9c0e SHA-256: ba88a00a70add9f3e879a56d292f314f9097372bb9da222e163cb4692e3afac9
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

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://baarspo.ru/strik?utm_term=chocolate+cream+dapple+mini+dachshund PDF link annotation
    • http://gapagal.mywebcommunity.org/sinaxemeguriterusozivado.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/30431466277.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/HNxhcSw/44482793058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482012/normal_5fd766acc12f1.pdfIn PDF document text
    • https://cdn.sqhk.co/tijaxasazuwi/hagjie5/gta_san_andreas_zombie_apocalypse_mod_free_download.pdfIn PDF document text
    • http://mutodute.22web.org/confidentiality_statement_template.pdfIn PDF document text
    • http://repipugokujo.iblogger.org/85919281393.pdfIn PDF document text
    • http://tazanup.mypressonline.com/the_authoress_of_the_odyssey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5ff4442fd977f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454422/normal_5fd8b73d4f79c.pdfIn PDF document text
    • https://cdn.sqhk.co/supetudoti/age8ijt/amazing_grace_song_sheet.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/basic_math_word_problems_quiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voginafukut.rf.gd/suara_cucak_ijo_mini_jantan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70032c7-7375-4ba1-982c-ae5b66771946/nosql_distilled_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a28b286-ecd3-433e-bec1-0bf8145f4873/how_to_remove_carburetor_on_troy_bilt_lawn_mower.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c462b1f6-a8af-4796-a861-fc56d60b570f/89121342872.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 5220 bytes
SHA-256: 3fa326c3525fa803abcddb2fe267a54ae495d23b7f665b149220c237daccfb9b
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10740 bytes
SHA-256: 26e4d59542d07df0721c683248ee41697c25c3e39b8eba87912dc707e5eae9a0

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