Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad6a3c4fa8f6fe6…

MALICIOUS

PDF

83.6 KB Created: 2021-04-24 19:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 814603f488b03fd721c4a9e58c5b5ba9 SHA-1: 9b645ec66a3f917c674e4b24c494e8d0ac63ad3b SHA-256: 4ad6a3c4fa8f6fe6659888be143358606b2fe5a9abaa1928371e6fb9fff7bdc8
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=how+to+change+a+thermal+fuse+on+a+gas+dryer PDF link annotation
    • http://suxoxaxowigab.scienceontheweb.net/captive_prince_short_stories.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_6006be3531dfe.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/how_to_draw_flowers_in_a_vase_step_by_step_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/gyLl31w/red_velvet_cake_recipe_uk_without_buttermilk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fdd917b85743.pdfIn PDF document text
    • https://cdn.sqhk.co/bitenutugiw/ghgjibx/english_language_learning_app_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fe7ecb499e41.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/mufivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_6039384aca57a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_60044f3cedc44.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/fgcpMgc/download_pocket_arcade_story_dx_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/jehmrid/athletic_apparel_wholesale_distributors.pdfIn PDF document text
    • http://kutivefivugokev.mypressonline.com/arabic_language_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5fed4619a1cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402740/normal_605bc727eceee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_600b0238dc467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_aeb2f694114f48bf846a43c28680e30d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/sasesirasixijoposokonotus.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/bexodawor.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_112713db7d5a4893b00bd34f2dba419c.pdf?index=trueIn PDF document text
    • http://vebusatoro.atwebpages.com/haier_10000_btu_portable_air_conditioner_review.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_88e1d7719f384865bcf8908cd587a5d1.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_56ea37af171140239fd4f50a01b5e801.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_1fa818de9db944a694632533b509e45f.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_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 5592 bytes
SHA-256: 36962ea0afbe64a149664526d5788dd63d736d1a63c323b5d23b524b477f3084
font_01_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 11476 bytes
SHA-256: 1a634db1499f97140fd6966c07b8eef0c91e453ae0aef1fff2ba2b5a80c69b8d