Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5feb8646ff899ea…

MALICIOUS

PDF

74.3 KB Created: 2021-02-21 10:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 791e3c9e1016fa357f08f139516417c7 SHA-1: 4e40df694ba5f2f6b74ce35d6a983e67d9ea7a74 SHA-256: c5feb8646ff899eaccda4f964f1eb7555225e588b768c26ce70b19e96ab3528d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a query about Victor Frankenstein's illness, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=what+illness+did+victor+frankenstein+have In PDF document text
    • https://cdn.sqhk.co/xopuxuvop/gjJhiic/50514407702.pdfIn PDF document text
    • https://cdn.sqhk.co/ropesuzuruf/ZyYjahc/duwewavopebisukubuwem.pdfIn PDF document text
    • http://yourbigdick.space/speedy_cash_loan_app_download4048m.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/oIgi1jg/3682684595.pdfIn PDF document text
    • http://blu-ital.space/vebevitagdj.pdfIn PDF document text
    • http://ravujonawugip.22web.org/savapeniretex.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/xNihgSF/starcraft_2_cheats_in_custom_games.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/jdghibx/marketing_plan_meaning_in_business.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/UifOYhA/fifa_world_cup_1990_song.pdfIn PDF document text
    • http://manthoughtswebsite.website/neha_kakkar_new_song_download_wapking2eiex.pdfIn PDF document text
    • http://gamedv.design/e-_gamsat_practice_test_answersjyx3p.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/iajjow4/lanojavinagovi.pdfIn PDF document text
    • http://fullhp.info/outlast_1_viet_hoaso1lo.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/jbQjhKm/best_apple_watch_6_screen_protector.pdfIn PDF document text
    • https://cdn.sqhk.co/demawanetufi/vghgije/word_of_the_day_bible_catholic.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/BKjcDhe/duvojudizewodagij.pdfIn PDF document text
    • https://cdn.sqhk.co/gumoxixo/R2CAbmM/javojikireradupi.pdfIn PDF document text
    • http://qqkaxes.xyz/nijisudemozasezibekutoluz53ph0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kujarison.rf.gd/48651476410.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/google_chrome_cnet_32_bit.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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 5248 bytes
SHA-256: 0dd4a15277921d2bf7741dc0b0cf180d7ac0e9339ad8d0f610054eb6dba790ef
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 10080 bytes
SHA-256: 778095b362425e58f056ee92305e021e2b0f39ed7e531c198b323035941c6525

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