Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba506db3326146d…

MALICIOUS

PDF

69.6 KB Created: 2021-05-12 19:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 98c37ed7eef2fa761839ad1f80bd4c75 SHA-1: 2339be54db4eb50ab66a89b3b41e71123fbb1a13 SHA-256: cba506db3326146dcaaa98fefa54b91eb8ae53e160f604914a74ca52d783ff91
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked URLs. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+use+lesco+spreader PDF link annotation
    • https://cdn.sqhk.co/pedidagow/a7jiCcO/liguduru.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/hgTj6hc/emotional_freedom_technique_aka_tapping.pdfIn PDF document text
    • http://it50life.pro/3307415590342w5c.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/learn_c_language_in_hindi_for_beginners6e6od.pdfIn PDF document text
    • https://cdn.sqhk.co/duwutawuna/jbQEdgd/aquacomputer_aquaero_6_xt_manual.pdfIn PDF document text
    • https://vumevomuw.weebly.com/uploads/1/3/4/3/134335884/sikebolu_liguxub_gozizoba_wotanizekux.pdfIn PDF document text
    • http://startask.ru/68948391037hmv93.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/141945.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/lesofekaxakoperep.pdfIn PDF document text
    • http://life50it.pro/tica_para_amador_resumen_captulo_1_al_69674z.pdfIn PDF document text
    • http://net-klientov.ru/lofemdv4oz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_f264151fcc77414bbb5f7303c92c55b2.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_abeb4483ab8f4e1383b3f111dceb7212.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_6a0dc46616e24b0ca8d14ecf135384a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/ac_market_apk_2019_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/92551241937.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/100_words_every_high_school_student_should_know.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_23e155e5c3604386a1684adcd3cea473.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/kcse_revision_papers_and_answers.pdfIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_12c5743a7480407ab6ab2b2c2d9d8eef.pdf?index=trueIn 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_off0000d051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD051 5120 bytes
SHA-256: 1e8044a116b3bd8f40db4ef1bfeea5a6b3c6dae96104267aed0469323ce24a21
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 11740 bytes
SHA-256: ba4f8d96640925a45137509eee720d17d21e677159a7b8e3b3348e99c5ddc500