Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7884fdd181754f2…

MALICIOUS

PDF

71.4 KB Created: 2021-02-07 14:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aa19d4a528e738cb45b17d38e767dbd8 SHA-1: b10ced356f97599e27a485d70f855393c80a8789 SHA-256: d7884fdd181754f2bd2ff6bdf4b99c156f69f5285f7cc518464b432babfc3d14
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to popular software like 'Candy Crush Saga', indicating a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/aws?utm_term=candy+crush+saga+pc+version PDF link annotation
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/4576801.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/9307141.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/eJjipLG/music_player_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/ZYji3KG/house_of_fear_surviving_predator_pro_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/iAWl6hd/bikufenoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rusobotakox/iaghhdM/44460486112.pdfIn PDF document text
    • http://rent-nout.site/bsf_online_form_2018_gdjhpsu.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/dmSigij/95075552408.pdfIn PDF document text
    • http://1xbets-regs.site/the_entry_made_at_the_end_of_the_accounting_period_to_record_wages_incurred_but_unpaid_isxdb5g.pdfIn PDF document text
    • http://damvglaz1.xyz/803832733986l0qn.pdfIn PDF document text
    • https://suxavumopej.weebly.com/uploads/1/3/3/9/133999634/fedizu_muvekexosajowa.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/HMia1gi/scary_sound_effect.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/2jeQHNN/cable_swing_coat.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/tawosutosuxi/random_video_call_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/ayatul_kursi_english.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/libro_de_cova_materiales_dentales_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/porixegilow.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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 5368 bytes
SHA-256: c49e8e5e5a9089cb65ed93f241fa90c07385deef9fe3e27c4327d379e2fce15c
font_01_sfnt_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10936 bytes
SHA-256: 8f5ce72b64b43ddc8037260deaac4a792e715620010b04e6dcaadced683c5a54

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