Malicious PDF — malware analysis report

Static analysis result for SHA-256 491f0063aa3ba367…

MALICIOUS

PDF

76.1 KB Created: 2021-02-12 12:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3cd49373161bfba02672c9ae3d949479 SHA-1: c01f4c7efab1fb09a237b4f72c302ba0947bb776 SHA-256: 491f0063aa3ba367e93c0602e0495f2f8e2d08f903186db5aeda53a9ae21597c
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The embedded links, such as 'https://yafferge.ru/123?utm_term=getting+to+know+the+periodic+table+answer+key', are designed to lead users to potentially harmful sites. The document's structure and content suggest a phishing or scam attempt, masquerading as legitimate information.

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
  • 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://yafferge.ru/123?utm_term=getting+to+know+the+periodic+table+answer+key In PDF document text
    • http://virenoveza.22web.org/vezasugidipa.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/hehcjpd/fantasy_football_championship_trophy.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/i0ifgcj/25641453801.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/cY4fKhf/become_president_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/fepogosu/hmXJOhd/electrical_wire_size_calculator_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/hhhhMie/disc_golf_park_bowling_green.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/QgfIidy/pregnancy_2nd_trimester_week_by_week.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/lma5jhi/fruit_slicing_game_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/8hddjaT/download_game_stickman_destruction_5_annihilation_mod_apk.pdfIn PDF document text
    • http://revujutipisan.22web.org/nutiva_chia_seeds_nutritional_information.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/chuyn_t_file_nh_sang.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/bufexa/blackberry_z30_autoloader_10._3._3.pdfIn PDF document text
    • http://janeresofopojaz.epizy.com/cfa_level_2_2019_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/mazak.pdfIn PDF document text
    • http://kepipejesa.epizy.com/banun.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/free_ripple_gain_free_coin_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/41603116263.pdfIn PDF document text
    • http://kutadomirezo.rf.gd/bums_in_the_attic_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/z_black_song_mp4_mr_jatt.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_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5764 bytes
SHA-256: ac7bc6c1ebf4625ecd0e5e2af057fa866ed2ca2801fbc2aefadfc21e77ce5983
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 11184 bytes
SHA-256: bf176fdb28d7c6e372307b82b4d9249503086fc2681fe717eaeaed363226de90

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