Malicious PDF — malware analysis report

Static analysis result for SHA-256 37db738b7d75ebda…

MALICIOUS

PDF

128.8 KB Created: 2021-04-02 05:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b58ef781221f8b225d8f232ccc8b1469 SHA-1: 82575e0ff57214260b4d2e60abec0a63e558cb81 SHA-256: 37db738b7d75ebda218a3ca2f14cad662741a5d9ebb319ce3bb8ba82c5016cdf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being https://pelibifir.ru/123. This suggests the document is designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • 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://pelibifir.ru/123?utm_term=astounding+science+fiction+android+saga PDF link annotation
    • http://jaxebememapi.iblogger.org/maxizodojawino.pdfIn PDF document text
    • http://zelijek.iblogger.org/please_open_holster_to_answer_the_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/jeCfJhg/rurit.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxazazul/FZTge69/voxabibedipib.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/bjaijDH/apple_archery_eliminator_bow_press.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69ad7fb-dd17-4814-bf2b-a64319283a35/monepepiliju.pdfIn PDF document text
    • http://paporoj.rf.gd/blackdecker_rc506_6-cup_cooked_3-cup_uncooked_rice_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dceee48d-fd75-4d51-9dec-d8739faa31e5/24881097253.pdfIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_2413b535c28f4b5cba8ab02844220545.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/29632372616.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/is_subway_steak_and_cheese_healthy.pdfIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_3a4b32d45e2648de80b26a6c20548512.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/49172716538.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/ver_pelicula_el_conde_de_montecristo_online_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73b12a7c-4d1a-4cc1-ad90-0938f3ca596c/jojakisupati.pdfIn PDF document text
    • http://renebizokav.epizy.com/process_costing_solved_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/vazakukeganama.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/vupoxisibexubemevab.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/cisco_firepower_2110_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/bedamunijesanek.pdfIn PDF document text
    • http://xetobagog.rf.gd/nikemirinupasodi.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/sezop.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_20f190a955f544589a0b1b99c4c7bbdd.pdf?index=trueIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_f782694d65644dc19fd6c927f694d275.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/android_oreo_notification_icon_color.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_c6fe72826a064e4eab0767309c159baf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b829933f-d632-4ae2-967e-80e7dceb5a9c/chemical_formula_for_epsom_salt_and_water.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_off0001bb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB11 5144 bytes
SHA-256: d959ee2b884fc57059add7c42ded32820f76038de5a1eeda5927ed5a652ed3c8
font_01_sfnt_off0001cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCA5 12152 bytes
SHA-256: bbb604fe1bbc1d30286432f18e24d7f517b293ef21ff49963b89047b65d05e27

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