Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad10de1dcf955c7…

MALICIOUS

PDF

80.0 KB Created: 2021-03-10 09:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89869b3ca4dbbb9c88a91544ba037398 SHA-1: d8ffc9f6c653e049825f22c95219563511f328df SHA-256: 3ad10de1dcf955c72147cb0657b05c37eba6865926d51b86e0d385bf25e08e41
176 Risk Score

Malware Insights

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

The PDF contains multiple invisible links, one of which leads to a CAPTCHA-themed lure, suggesting an attempt to trick users into providing credentials or downloading further malware. The presence of external URIs and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a Samsung product, possibly as a distraction or part of a broader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/aws?utm_term=samsung+hw-j450+factory+reset
    • http://leyloften.online/xufoxaresinfhgf.pdf
    • http://casserlabs.xyz/97261026589yst31.pdf
    • http://avbox.org/16632609884ug37f.pdf
    • http://faromobipon.22web.org/tuzepibe.pdf
    • http://bloodcraft.online/seroma_en_cesarea9lw5w.pdf
    • http://henrysavbr.site/92353018472fnmfr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tometubufimopim/enseanza_del_libro_el_caballero_de_la_armadura_oxidada.pdf
    • http://lajirobodogew.epizy.com/best_nature_wallpaper_for_pc.pdf
    • https://s3.amazonaws.com/wupiwupiwot/28212548294.pdf
    • https://s3.amazonaws.com/pirofopafu/cartoon_movie_2013_free.pdf
    • https://s3.amazonaws.com/vososasoxumete/8_manualidades_faciles_para_halloween.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/arsenal_vs_chelsea_match_report_goal._com.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/captcha_login_form_php.pdf
    • https://uploads.strikinglycdn.com/files/f509d4c9-4782-4434-9152-6460040772a9/hunter_gsp9700_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/b11bd689-1dd4-49ca-9732-59c7d0d97e96/how_many_miles_will_a_2010_chevy_traverse_last.pdf
    • https://s3.amazonaws.com/mejifavo/latest_bollywood_movies_in_mkv_free.pdf
    • https://s3.amazonaws.com/jopomodilamego/acer_aspire_one_zg5_drivers_bios.pdf
    • https://s3.amazonaws.com/pivetuzadujo/5_little_ducks_piano_sheet_music.pdf
    • http://nadovudeduxawos.rf.gd/sasik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f952.bin
e80f44cbd89d52ccf37fa0fcecf7e9775e6917c849c1235b400a6cf14da7e2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 6020 bytes
font_01_sfnt_off00010dd1.bin
a1c0677816decb6e3cd0b0142673a30d754b3af7341fa7f586e0616331ed2f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10748 bytes

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