Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1b622577804b4d…

MALICIOUS

PDF

77.7 KB Created: 2021-02-26 23:37:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 88cd9f93e04f6d33ba35bf8362e42f28 SHA-1: b4feaf02635c1c26c49d07871a57d5cd96fa1f6a SHA-256: 8c1b622577804b4dc74626ead74726063d22509fb11e5f7dc17b80aa7fe1d26f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains a lure related to resetting a Samsung ice maker, which is likely a pretext to drive users to one of the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+reset+samsung+ice+maker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64b961cc66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_5fe59ddff0cc2.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/the_crown_season_3_episode_8_wikipedia.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/fundamentos_de_mercadotecnia_miguel_santesmases_gratis2nrqu.pdfIn PDF document text
    • http://namelesssouth.xyz/tennis_game_3dc12sz.pdfIn PDF document text
    • http://nikecortez.net/abbe_refractometer_working_principlekbjc8.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/fgggjOl/ms_pac_man_game_boy_color.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/61088487500.pdfIn PDF document text
    • http://tradestaroffice.com/the_watsons_go_to_birmingham_chapter_11_quoteswbvy5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5ff0da63d47b2.pdfIn PDF document text
    • http://vekvelo.ru/49460695330o1vub.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/how_to_get_bookshelves_fast_in_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jbhbggc/marble_tile_bathroom_home_depot.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/vituwifowegenituvopibobir.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/2sjhbgd/zamofijasuzepojonovuxopu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedisijusa.onlinewebshop.net/which_bare_act_is_best.pdfIn PDF document text
    • http://zuputes.atwebpages.com/12852722152.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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 5204 bytes
SHA-256: 00a6a4661938b65eb40a5655a61409449e4da0922f39e49350c970f8951e8d27
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10972 bytes
SHA-256: 9ed817a2a3dfe4d04e9834c0f706789436ee892456404a31baac5a4144c47145

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