Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e779e70e2ae653…

MALICIOUS

PDF

81.5 KB Created: 2021-03-15 23:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6f6b03eb83eb8cde93198227e8969fa SHA-1: 727791dfe2e4962ced2477bcdf2a880f245f4429 SHA-256: 99e779e70e2ae6534ebd9e7d6fad71cd95209a5a0f52ed38e6130e27fbd55136
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 0.9992

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://gimoguvi.ru/123?utm_term=spotify+songs+online+free PDF link annotation
    • https://cdn.sqhk.co/luvafuza/gevideN/the_division_last_stand_2020.pdfIn PDF document text
    • https://rusezoxebob.weebly.com/uploads/1/3/4/3/134355184/xefazomuvogo.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/d1b439a5.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/gdZIudN/ringtone_download_mp3_iphone.pdfIn PDF document text
    • https://banetopebored.weebly.com/uploads/1/3/4/8/134874573/xumadolu_dozomimixu_fototubusuxobor.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jc5Vxia/buyback_offer_letter.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/lovejidagolopanani.pdfIn PDF document text
    • https://repepojopojak.weebly.com/uploads/1/3/5/9/135970902/wamevulotekoxo-zitage-xomusekito.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/bhyhdeK/supekiwugivebokez.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/wositonosivakipevov.pdfIn PDF document text
    • https://cdn.sqhk.co/niripakexad/iqhfgcW/43901340447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/18587583223.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_0e32d03767534a1aa7a3cd84d5ac188e.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_738d13d1a3754fdba97e35ee1bc4460e.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/64885742041.pdfIn PDF document text
    • http://gogujigasad.onlinewebshop.net/persuasion_skills_black_book_download.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_3fad61e61e934b31afc0d3967db7c2ae.pdf?index=trueIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_75ad4029b99648d28239d6da70bb9539.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/trigonometric_identities_practice_worksheet.pdfIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_653a81389f6d4e88a0fcfdec91a265a4.pdf?index=trueIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/bartender_cv.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bully_dog_power_pup_diesel_er.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/converting_measurements_worksheets_with_answers.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 5064 bytes
SHA-256: 5b491f9eb37c9e65937a06ec3ce14d899feeddb32474f9b63a3844afbede0267
font_01_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 11628 bytes
SHA-256: 938a7d253e30f67697fe4adc18c7e8a53a41dfaadee860526157447b0b7c00e9
font_02_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 16628 bytes
SHA-256: 0edaf20887b6fa97af11b68fb5a14423f5f53e9da2dc24dfa575a6c2b0090066