Malicious PDF — malware analysis report

Static analysis result for SHA-256 d953cbf4379f9a3f…

MALICIOUS

PDF

74.1 KB Created: 2021-02-07 07:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be27cf64ad32c5e4019c063e1de1ab21 SHA-1: cd5fe5ecbefa8b2e53784fd7bba244c969c0f57a SHA-256: d953cbf4379f9a3f8f99cde97cf08c83ca9cec13028e5678f0cdd7993d047ef2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains text related to 'Android emulator free windows 7', suggesting a lure to drive traffic to these external sites. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for SEO manipulation or phishing.

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 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://leonvi.ru/aws?utm_term=android+emulator+free++windows+7 PDF link annotation
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/5509492.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/ihgFelI/nizenejilivomusif.pdfIn PDF document text
    • http://pabixigenived.22web.org/human_centipede_full_movie.pdfIn PDF document text
    • https://bemazoveber.weebly.com/uploads/1/3/4/5/134512295/nonilorurenivi_jewejisov.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/3693451.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/nelizenejakarug/minority_report_philip_k_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/battle_cats_mod_apk_anti_ban.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/vmware_l3_support_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/pozupidimegamu.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/73962945970.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/ragnarok_mobile_m_eternal_love_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/dotadidum.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/65550516179.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5212 bytes
SHA-256: dda5f6a92d249060612c97a7f140399bd830da54275ac5474a8d578dd309e1e8
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10496 bytes
SHA-256: 9657217faea14f7baa4424ca9636ca866e039414a72e7dbb87e1c17d04bd047b

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