Malicious PDF — malware analysis report

Static analysis result for SHA-256 500b74b26b50e601…

MALICIOUS

PDF

167.7 KB Created: 2021-02-12 07:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dcf2c0e99f2f1f9ad79255d8ddd2828e SHA-1: 3ce012bf5d513048b3f6371cb4a9e802b75be8ad SHA-256: 500b74b26b50e60168ffd74aecc9e7de8958c4477871384b218064234fda8d84
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, 'https://crophysi.ru/123?utm_term=mth+dcs+tiu+manual', which is likely used for phishing or to download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=mth+dcs+tiu+manual PDF link annotation
    • https://cdn.sqhk.co/jotapepikota/jfMGNhi/dribble_hoops_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/cjTjczQ/raxome.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/jczjjc8/39396135048.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/rising_star_the_making_of_barack_obamadfmy1.pdfIn PDF document text
    • http://idealicaufficiale.website/amazon_echo_dot_appsmogv.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/jeHibjg/dinosaur_wallpaper_iphone_xr_hd.pdfIn PDF document text
    • http://sallehq.xyz/rotozadanimezeg3cavj.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/NHjfJJK/dream_player_for_android_tv_full.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/dgeghiZ/17843200060.pdfIn PDF document text
    • https://cdn.sqhk.co/nubenirosife/f37RgcC/26985690903.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/hihnhdQ/windows_10_64_bit_keygen.pdfIn PDF document text
    • http://pr-bux.online/687110740637w75p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kosamupim/alien_shooter_vengeance_full_version.pdfIn PDF document text
    • http://wivirimudip.epizy.com/brahmachari_1968_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/psychedelic_rock_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/zodiloner.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24B60 4744 bytes
SHA-256: 183a674c667f3e5af0700193d9d0d2ed89dfbc7dd2d1b35de881a4cb24b7d2ec
font_01_sfnt_off00025b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B4A 12044 bytes
SHA-256: 50d5b3d41d7641c67f3765bccb70586a3da494e5b8339f543fa772b5feb72ede
font_02_sfnt_off00028398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28398 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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