Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea334492ebac6e…

MALICIOUS

PDF

79.9 KB Created: 2021-04-02 12:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1d2927c45416c854ea0ee9bb3f2661e SHA-1: 70213a802dfc7fef77f6816a9a8aad63f9694526 SHA-256: 99ea334492ebac6e9ef05dea2a05f9f5eea9bcf154b478ae1d852b3fb51b5c98
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 0.9993

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
  • 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://maypoin.ru/123?utm_term=meditation+guided+imagery+for+sleep PDF link annotation
    • http://gagarinski.su/rslogix_5000_training_softwarem5lq2.pdfIn PDF document text
    • https://besunuvoduzusub.weebly.com/uploads/1/3/4/2/134266379/52f87bc.pdfIn PDF document text
    • http://fitokapss.xyz/easy_duplicate_finder_licence_key_freen5ejo.pdfIn PDF document text
    • https://jujokubibafa.weebly.com/uploads/1/3/4/6/134621517/3840929.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/gijaRI2/68259658773.pdfIn PDF document text
    • https://cdn.sqhk.co/jogekiluse/Lhdibqc/the_aether_life_as_a_god_achievement_guide.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/download_manager_wordpress_problem_android.pdfIn PDF document text
    • http://itnegozio.info/xarododovejemorabetunwblpt.pdfIn PDF document text
    • https://nolomiwasuwizug.weebly.com/uploads/1/3/4/6/134661688/negazinugiwa-jonogaxix.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/qhbiipl/hidden_escape_lost_temple_walkthrough_chapter_7.pdfIn PDF document text
    • https://cdn.sqhk.co/kakolutezegu/gF6qicN/ccnp_300-_101_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/gLOgjte/5141499226.pdfIn PDF document text
    • http://copyrightshelpcenter.com/12200873358gg9ge.pdfIn PDF document text
    • http://nigasheff.xyz/cheltenham_condensed_font_freeepmv9.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/how_to_use_a_whirlpool_thin_twin_washer.pdfIn PDF document text
    • http://shlifovka-pol.website/sixisiruwifomaduredidafux5r9tr.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/gerazusi.pdfIn PDF document text
    • http://claire-irk.ru/netherland_dwarf_rabbit_rare_colorsh8zv4.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/cyber_attack_definition.pdfIn PDF document text
    • https://validujagobun.weebly.com/uploads/1/3/4/5/134526773/jepof_safesuravex_fekepajotaji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_804c0b6fa2d5448db86dc0fb3e54016b.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d38d2efa66a54326b3fc7c58b070a60f.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/what_is_the_best_temperature_for_a_whirlpool_refrigerator.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_38558691ce5a43bfb9092eee29d65af9.pdf?index=trueIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_d60fba4694504adbbb27bb158cac4edf.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 5468 bytes
SHA-256: 695a12ac4c823656c6e5d35691f436e71bf385106af1edf0effd69dfcdf496a8
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 11176 bytes
SHA-256: cb795c918d201ae526de8c4e85830725d7ad590441174907162d805c78fb5805