Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e9a0d46aec030b…

MALICIOUS

PDF

72.6 KB Created: 2021-02-24 02:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bf710112c41568a5b8f41726c9c6a94c SHA-1: 2a49ded2b20a9d45a2e220c4bb06ef1adcb7aa01 SHA-256: b1e9a0d46aec030bbfa5093934321e11bb75104fef69fe88edc03d898d1468b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a tactic to drive traffic to potentially malicious sites or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=the+mousetrap+london+closing PDF link annotation
    • http://tisigetid.iblogger.org/android_9._0_features_note_5_pro.pdfIn PDF document text
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/7233325.pdfIn PDF document text
    • http://logvoz.ru/keziniritogolikazenqoiq.pdfIn PDF document text
    • https://jironomazubem.weebly.com/uploads/1/3/5/3/135393756/6322099.pdfIn PDF document text
    • https://divupamafotot.weebly.com/uploads/1/3/0/7/130739309/kidal_bobun_rujogete_kepisinibu.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/505f0087822a6f.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/mixanaz/81371910977.pdfIn PDF document text
    • http://nabotiwufonego.epizy.com/silizafitovugujikopo.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/android_sdk_manager_visual_studio_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bahubali_3_2019_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/87955459029.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/tavijaxutenupow.pdfIn PDF document text
    • http://tiwogiponifi.rf.gd/lafepifidosutol.pdfIn PDF document text
    • http://dusiwesidixe.epizy.com/95874525517.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/how_do_i_forward_my_nortel_phone_to_an_external_number.pdfIn PDF document text
    • http://fogalefudomuj.epizy.com/18111660972.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/20865299590.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/alternative_dispute_resolution_act_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/clavier_espagnol_android.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_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 5436 bytes
SHA-256: 255a8137c29c94de70b3b8879641316ed588fe088e1acba2e1382e519354bde7
font_01_sfnt_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 10916 bytes
SHA-256: 54ae89425e53e18624e777852073bacb20e030c24049c01213a0788d436e2506

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