Malicious PDF — malware analysis report

Static analysis result for SHA-256 590fdcad214c9a71…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 19:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 317497e050f7c86edb8c232627339752 SHA-1: a5179f420a5cf97bfa2c20e7999d2998dd99e2af SHA-256: 590fdcad214c9a7157de47927d5e1ebe2ce8f1124fa21187d4b54fce193f0fae
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URL `https://midufefew.ru/strik?utm_term=a+midsummer+night%2527s+dream+summary+act+1+scene+2` and the PDF document itself point to a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL usage suggest an attempt to redirect the user to a malicious site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=a+midsummer+night%2527s+dream+summary+act+1+scene+2 PDF link annotation
    • http://ruguwafe.scienceontheweb.net/agudas_graves_o_llanas_esdrjulas_y_sobreesdrjulas.pdfIn PDF document text
    • http://fodelogutejamit.getenjoyment.net/jeet_kune_do_classes.pdfIn PDF document text
    • https://cdn.sqhk.co/wovenebi/cifgghe/strawberry_shortcake_dress_up_dreams_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vefutifeves/4ghhi8E/free_music_download_app_for_iphone_xr.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/HL4Xwii/sodivujewew.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/73760304717.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/sigobija/nazm_hikmetin_ayasofya_iiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8ce974-5109-4551-bc69-1aaf7b1543be/51034833316.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/kuiu_guide_jacket_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6321dea-ce75-4729-97c2-8b7aab8b9821/38939001438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c738dc7-bde9-4b59-9419-a5d5404e50ea/horton_hears_a_who_full_movie_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/27500190161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf3cb87-66da-47f6-9079-4b2d9ee856cc/symptoms_of_a_blind_pimple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994a1a4f-d5fc-45c2-838d-e412750ab9f5/lumosota.pdfIn PDF document text
    • http://vugugemo.atwebpages.com/bayesian_artificial_intelligence_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/bryan_hawn_the_list_free.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/kovegobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b56ff04-c1bc-44ce-a501-6aa10503dfa2/virginia_woolf_on_being_ill_summary.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/ascii_code_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9314d2-bc14-4fc8-978a-a4c91bd8562d/bazasi.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/tutorial_of_plc_programming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5602a1-f640-4299-a320-79847277c533/how_to_connect_xfinity_modem_router.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_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5632 bytes
SHA-256: d1077be4876a574b155137c41e2e9d88343b15f0c86f93a7492dc03c5b14a391
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 11160 bytes
SHA-256: 651f695d6cf70dc3a56693a601083315c17f0ef32e460fe6b1fd577ad15bea2c