Malicious PDF — malware analysis report

Static analysis result for SHA-256 413f8a6252af3e05…

MALICIOUS

PDF

88.6 KB Created: 2021-06-01 22:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f4bfcec22955f584dbfa2cddcda69f61 SHA-1: 537c0ffb1a90234118e30f33cf604e57151ac43a SHA-256: 413f8a6252af3e057c1ca6820db0614cbb52673e29e26eeaca08c30f56f831e2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://queure.ru/pbw?utm_term=ver+persepolis+online+sub PDF link annotation
    • https://dulipitigisol.weebly.com/uploads/1/3/4/7/134717891/2771055.pdfIn PDF document text
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/64411dbf8c.pdfIn PDF document text
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/tedemivebawoxox.pdfIn PDF document text
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/pafibapesiwumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojirakaj.pbworks.com/f/evermore_beauty_and_the_beast_piano_sheet_music.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144412059/2019_hellcat_red_eye_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ed57eb-8fcb-4543-b8f3-c48e405d7764/can_amazon_echo_dot_work_alone.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144419367/how_to_install_apeman_c450.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/how_do_i_program_my_philips_universal_remote_to_my_tv.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/85327312290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98a789f-c9e3-47b5-8f77-4403aa160e36/tik_tok_song_mp3_download_free_all.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a080005-79bc-41c2-ba2b-a5450c7abcf3/vudavutevudox.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/605134733.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144424500/bible_reading_study_guide.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/90239644931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0b578c-37a3-4da4-97b4-741506bdb4d5/cloudy_with_achance_of_meatballs_dad_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d8cb8f-98cc-4f3b-90a4-0c5c5902733d/26908812572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622c9d36-cd88-402d-8e7c-2b64f0a1cc32/important_quotes_from_house_on_mango_street.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 4708 bytes
SHA-256: 472ce367e486be1e0776bc2bc0d089c5c433b01dd13d01db8f281c1e08dc4fa1
font_01_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 12160 bytes
SHA-256: 9c90e798b7fc15727e73ba272433bb26dafd9fb32732a6b23cf72bf4c4c70f0d
font_02_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb