Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f105ce8ccc33add…

MALICIOUS

PDF

72.2 KB Created: 2021-02-25 13:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 20d8f9770e25c5900f7eb139919e3904 SHA-1: b27f9681183f84ee63337290224e6c99b22779dd SHA-256: 9f105ce8ccc33add96ade712cd68c37d7c59f62912153d783ff050b8196fcee3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to contain text related to 'how to clean a salad spinner', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=how+to+clean+a+salad+spinner In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378623/normal_5ff7f32cd7136.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/cost_of_living_index_by_state_2020.pdfIn PDF document text
    • http://titanof-filtr.ru/rusafasafonukotar0yrdo.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/define_equus_caballus.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/how_much_does_a_catalytic_converter_cost_for_a_subaru.pdfIn PDF document text
    • http://kellys.space/zavozusobajatefipirukotisrgzp.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/how_to_replace_belt_on_hoover_elite_rewind_vacuum.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/present_perfect_subjunctive_spanish_exercises.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/ruger_air_hawk_elite_ii_.177_pellet_air_rifle.pdfIn PDF document text
    • http://shtancircul.site/tulasi_kannada_novel_free_download1uyek.pdfIn PDF document text
    • http://help-copyrightservice.xyz/libros_de_harry_potters8p85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepofif.onlinewebshop.net/70881459371.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/reflection_of_light_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/vitamin_c_dcpip_experiment_report.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 5120 bytes
SHA-256: e060e9edce26db403dd6abb78364b215aa76e07ea9dcb07067d0933de702d6a8
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10868 bytes
SHA-256: 2ec1ecd8e647a077e540f13504ad7e940d166dea9495f3a59b43908c13175566

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