Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e46e35cc8625d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-27 22:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9f718d9820fa07b704bc2aad70e2dc48 SHA-1: 0de500e9850eae3d1ebd501a4445d4c2da2fd4f6 SHA-256: 3a5e46e35cc8625d467afbe3053ae640b0f5328ce617d29c86591ca99e520311
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers as malicious. The document body, though heavily obfuscated, suggests a lure related to 'email writing format samples class 8'. The primary malicious indicator is the redirection to the URL 'https://lozipotod.ru/123?utm_term=email+writing+format+samples+class+8', which likely serves as a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/123?utm_term=email+writing+format+samples+class+8 PDF link annotation
    • http://sizuxofutitarax.mypressonline.com/dd_5e_players_handbook_with_bookmarks.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/dnbgjgi/tekugaxefeliluteful.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/how_to_reset_a_cateye_velo_wirelessg08vf.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/kukjiuq/solarx_eyewear_uv400.pdfIn PDF document text
    • http://nakanilo.club/losing_my_virginity_richard_branson2cc62.pdfIn PDF document text
    • http://sluzhba1.net/amartya_sen_development_as_freedom_ebookh09zy.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/hbgiygd/wubasor.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/bootstrap_cheat_sheet_2020.pdfIn PDF document text
    • http://bupro.asia/legomikepinp7ah.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/8hbiahz/flower_garden_ideas_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/ijsOcha/geometry_dash_download_unblocked_weebly.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/proform_6.0_rt_2.0_hp_motorized_treadmill_reviews.pdfIn PDF document text
    • http://umkatrade.ru/ge_8_device_backlit_universal_remote_control_codesb141c.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/2zjcQES/52296573575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_5640b08206c24a5eb279d3c12f4af647.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_d1fc77bd8f32403ab5758f8b9469e863.pdf?index=trueIn PDF document text
    • http://fuluxewamotate.atwebpages.com/mathematical_physics_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/tisokaviwixovevidalewuzen.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_85d07f11ed3e4f9db48eef0daa605481.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_7a5f55e9115f4a96a319de1d09a5cd03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/dogijedez.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_a3166e6f03df47dcb39dfc6ebc168cb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/jirolojimojewapiwasagab.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/5309920408.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5364 bytes
SHA-256: a615aa37fa4f8976bc61b0381767041cefac85dd2b4fb2f853cf76c1d6116f34
font_01_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 10852 bytes
SHA-256: 3c5ab89956d4fc9eb24d5f717255ea78dc0797819f6912beb9fbb6645f229616
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e