Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11c2d969c90acfd…

MALICIOUS

PDF

79.9 KB Created: 2021-06-11 03:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 83beb7123366513b039901a17ef678e8 SHA-1: 05cf60d6ddb061d0e9a7f608087f2db2124627ec SHA-256: b11c2d969c90acfd1c9eb87747c1c5a53e181d825404efec21a1d927d92153bb
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs, one of which points to a suspicious domain associated with a VPN download lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to trick users into downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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=secure+vpn+pro+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408720/normal_600bf05c2d223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_6035753df1378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477638/normal_5ffda3b4ae889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403531/normal_6050d274707de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_60184495a25ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374703/normal_5ff85385b9b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_606e2d6737de0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/f/biginubexinejegugoti.pdfIn PDF document text
    • http://xixapeg.pbworks.com/w/file/fetch/144846711/download_anime_strike_the_blood_s4_sub_indo.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144608655/ati_es1000_driver_windows_7.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144837774/76195125872.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/the_tragedy_of_romeo_and_juliet_act_v_cloze_activity_answers.pdfIn PDF document text
    • http://mopevot.pbworks.com/w/file/fetch/145007007/battle_dogs_mod_apk.pdfIn PDF document text
    • http://wisarazed.pbworks.com/w/file/fetch/144651627/basketball_stars_mod_apk_2019.pdfIn PDF document text
    • http://dazokarodu.pbworks.com/w/file/fetch/145100292/airline_commander_cheat_codes_ios.pdfIn PDF document text
    • http://rajejor.pbworks.com/w/file/fetch/144741630/81356676680.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2B 2912 bytes
SHA-256: 1dc4d53cc543180180c31573cc7ff31d5166e80dfe0f7d334e321c19e224dfc4
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5208 bytes
SHA-256: 8f9e3e58b67658d6b8de572e72ce6e2a8cc75daffeafb54b4c19215cf5301f50
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 10516 bytes
SHA-256: eddf05f7f57e3a673d58bbd25b8c841459abb4b2a5f0a8e42d37a5ede76f2f96
font_03_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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