Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d524af5f85c3564…

MALICIOUS

PDF

75.4 KB Created: 2021-06-01 02:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27bee77b141655389055d9231947c22 SHA-1: ea7bd4abdae9d012e97a607db259f408d8d511cf SHA-256: 9d524af5f85c3564331b0654dcdaea63138078b950d8395d41854487e0ac4cef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://allytemp.ru/pbw'. This, combined with a ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests a phishing or malicious redirection attempt. The PDF's structure and content, despite being heavily obfuscated, indicate it's designed to host a link farm for SEO manipulation or to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/pbw?utm_term=how+to+tighten+a+mower+deck+belt
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/bavalotozi.pdf
    • https://xolufoxe.weebly.com/uploads/1/3/4/5/134501271/099ebf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mikabipi.pbworks.com/f/free_download_adobe_flash_player_for_mac_os_x_10.5_8.pdf
    • http://xuruzinijub.pbworks.com/f/how_many_red_ace.pdf
    • http://garigor.pbworks.com/f/grams_to_kg_worksheet.pdf
    • http://tazijebep.pbworks.com/w/file/fetch/144419616/21294455551.pdf
    • http://mumubib.pbworks.com/f/96281506542.pdf
    • https://uploads.strikinglycdn.com/files/b9e15cc9-ebe1-49d0-a0f2-71381ea2ea2d/goput.pdf
    • https://uploads.strikinglycdn.com/files/a0f71dd8-6563-493a-bcc7-190cfd89f890/r_kelly_tp2_album_free_mp3_download.pdf
    • https://uploads.strikinglycdn.com/files/61ed09cd-909e-411a-ba64-5b614a021574/ar_15_magazine_capacity_california.pdf
    • https://uploads.strikinglycdn.com/files/0a096c34-f2c2-4129-9ded-0719d30f4928/modified_oleary_plaque_score_index.pdf
    • https://uploads.strikinglycdn.com/files/6ebb6249-137b-41d7-be46-a92c58fef018/89407253913.pdf
    • https://uploads.strikinglycdn.com/files/0e97898e-cac4-4a4e-879f-54d7a5ab46f2/cabrio_washing_machine_error_code_dr.pdf
    • http://giresizuloki.pbworks.com/w/file/fetch/144431877/53953999594.pdf
    • http://supatibu.pbworks.com/f/59448903249.pdf
    • http://dekokos.pbworks.com/f/97570837480.pdf
    • http://ruwezebom.pbworks.com/f/mini_dv_kamera_md80_software_download.pdf
    • https://uploads.strikinglycdn.com/files/fc04d316-33da-426d-923d-1b2e33645743/64115945404.pdf
    • http://nusuwoxub.pbworks.com/w/file/fetch/144416649/75532540809.pdf
    • https://uploads.strikinglycdn.com/files/9bfef0d5-6723-4351-8b98-40063a6e0085/contoh_surat_lamaran_kerja_menarik.pdf
    • http://xosufixemuf.pbworks.com/w/file/fetch/144431958/pro_football_game_tonight_on_tv.pdf
    • https://uploads.strikinglycdn.com/files/88ea0256-a9ec-4ee6-a032-f43d19840830/87312947205.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_off0000eace.bin
e36c737a5017ab503817d5447663aeb51981e9ef1b342d2acff2d2ce144832a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 5432 bytes
font_01_sfnt_off0000fd2f.bin
58bff945779d1bb36863cc3957467595f3a850ef1e535d305c1cd7bf9f772419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 10184 bytes

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