Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cb42a68574ea44…

MALICIOUS

PDF

74.7 KB Created: 2021-01-13 05:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4704457accbc76e00b9d87f92aef9b8e SHA-1: 8377027efb81b493bebe1a6626b08f5afe8ff53e SHA-256: 76cb42a68574ea44d19a585ab6c9577b292807db8a3d0e21f5bd673695e6e7f3
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of embedded URLs and the overall detection profile suggest it is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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://traffmen.ru/123?utm_term=civil+war+clothing+material In PDF document text
    • https://site-1177610.mozfiles.com/files/1177610/gun_master_3_mod_apk_android_1.pdfIn PDF document text
    • https://site-1210512.mozfiles.com/files/1210512/street_fighter_5_apk_pc.pdfIn PDF document text
    • https://site-1168088.mozfiles.com/files/1168088/chess_board_setup_pieces.pdfIn PDF document text
    • https://site-1175792.mozfiles.com/files/1175792/calendario_superbikes_2019_marca.pdfIn PDF document text
    • https://site-1196795.mozfiles.com/files/1196795/zuxafuzatesopogokitomupe.pdfIn PDF document text
    • https://site-1175531.mozfiles.com/files/1175531/56012171259.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/1igligH/solar_system_simulation_phet.pdfIn PDF document text
    • https://site-1177315.mozfiles.com/files/1177315/72478458121.pdfIn PDF document text
    • https://site-1217191.mozfiles.com/files/1217191/funny_cell_phone_ringtones.pdfIn PDF document text
    • https://site-1172728.mozfiles.com/files/1172728/radio_flyer_movie_netflix.pdfIn PDF document text
    • https://site-1172726.mozfiles.com/files/1172726/aprilaire_humidifier_control_model_60_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/MghhaqI/9785331901.pdfIn PDF document text
    • https://site-1175150.mozfiles.com/files/1175150/sopimif.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/mejobu/vpn_android_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/20139775346.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/vegas_pro_crack_version.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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 5092 bytes
SHA-256: 93ae7be27234cf0475813ef1f19f4dd5aafa7eeceb899863cfdab91fddbf7dc6
font_01_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 10472 bytes
SHA-256: 210475d2f51df1046a98a145291010a51a4224e526f8b193f589828e615b1479

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