Malicious PDF — malware analysis report

Static analysis result for SHA-256 283ed6037a0f9b35…

MALICIOUS

PDF

86.0 KB Created: 2021-04-14 21:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b787d24b2159176fe52afcbb4c577c19 SHA-1: 0e15f886d4d6162d564474f784b632a9a234baf2 SHA-256: 283ed6037a0f9b35aaab7f622341eb2514de2c9e7a2c30b541d0f046fbc60942
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. One prominent URL, 'https://gimoguvi.ru/strik?utm_term=samsung+camera+nx3000+error+00', is presented in a way that suggests it is a search result, likely to trick users into clicking. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing attack.

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://gimoguvi.ru/strik?utm_term=samsung+camera+nx3000+error+00 PDF link annotation
    • https://cdn.sqhk.co/nadetajagupe/dttAljj/rumble_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/jWgghgl/88177363625.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/wYijdhj/war_and_order_gameplay_ios.pdfIn PDF document text
    • http://xirijapip.mypressonline.com/armed_conflict_in_the_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/ViihLja/17600260720.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/aFDgege/pujadokadarurowepofug.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/parent_functions_graphs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/where_can_i_learn_arabic_online_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5752f742-51a4-4a2a-9e25-78efc12f3332/how_to_clean_black_and_decker_d2030_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2aad62-f9d9-4203-b8ce-a65fdc3d0582/curry_blake_dht_session_3_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168dc4a1-502f-4500-b099-72833d91f63d/30383430996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02505fe-7e3e-4254-b7d1-ad913b7c4659/order_is_the_foundation_of_all_things_meaning.pdfIn PDF document text
    • http://jidufatasakameg.epizy.com/munija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1262e060-d9de-4911-a9a4-cd81ec84f710/68166946973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391b2ef3-4735-403a-a89e-195e79d62a10/ms_excel_2007_complete_tutorial_free_download.pdfIn PDF document text
    • http://nexuvojof.epizy.com/63796827681.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/gotesoxazijasatasim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd23245-07ac-4f1d-9014-41e4dfec3510/fuwirunesakemimaxiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f24c79-10d9-4744-8321-c2723b71f106/78161641337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9b5a2b-d76c-43a8-95c1-675da6973d79/how_to_connect_my_camera_to_wifi.pdfIn PDF document text
    • http://ropobowex.epizy.com/vuxevexibofefovuju.pdfIn PDF document text
    • http://jakowufa.epizy.com/kaufland_akciov_letk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 5564 bytes
SHA-256: ab68541283eedebe21ffa0aa800de336f741fafd07536c1bf558d4efe0af8d12
font_01_sfnt_off000122e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E8 11288 bytes
SHA-256: f1f069388bbbab04e9bfc9edcbe4a6b88cea5f6745aa465fb651f028980249bb