Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddde93c4ddbb562…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 21:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1cebdea0fec59f34287be61063db39b1 SHA-1: d4ec5f6410bdedd3b4eb5ea141e678aa0528e285 SHA-256: cddde93c4ddbb56229d545f23677b465f184981b9ba55f2813e00ae3eee9c5d4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/aws?utm_term=what+is+ghost+in+the+machine+day PDF link annotation
    • https://fekipasipoxow.weebly.com/uploads/1/3/1/6/131637207/4001459.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/ihOAKgg/aarp_games_mahjongg_toy_chest.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/tijavuguviz.pdfIn PDF document text
    • http://medtechnika1.ru/power_systems_analysis_and_design_5th_edition_solution_manualyow9e.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/hghaI2h/kerupovujiv.pdfIn PDF document text
    • http://sportplays.ru/clash_royale_prince_deck_arena_13fj8u5.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/stay_hungry_stay_foolish_ebook.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/2189823.pdfIn PDF document text
    • http://creamspait.xyz/hp_officejet_5610_all-in-one_printer_driver_windows_10xcnif.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenelavup/Wgibsja/nobibotajuziferonakad.pdfIn PDF document text
    • http://helen-art.ru/fubarowaxifinomudezerofadngzw0.pdfIn PDF document text
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/wezigop.pdfIn PDF document text
    • https://cdn.sqhk.co/gupikekarobo/0jE8WxK/fekeli.pdfIn PDF document text
    • http://madamzero.com/netflix_apk_for_android_9kwe6k.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/fisulefajow/nezawasokusisabemorida.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_c90405d417d94c9995015880e8339bce.pdf?index=trueIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_025404a0612a49f2b6d6e215a0a1d17e.pdf?index=trueIn PDF document text
    • http://zagofij.onlinewebshop.net/hp_ultraslim_dock_2013_docking_station_d9y32aa_compatibility.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/94313009141.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_a178615ba06b421cba45ce967ba97eb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/kumano_kodo_trail_self_guided.pdfIn PDF document text
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_0766d01775ff49638a9e90f273d3b09e.pdf?index=trueIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_f2c3814c0fc84aa292764ee5837de82a.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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 5340 bytes
SHA-256: 7b48bc21e82b3312e5a1692a3c8c2e98cbacb6a518fa5d4585e4af3728627869
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10480 bytes
SHA-256: 1cb0676b36d9a257d4d4e168ecfc024f1c75abbcad4625ab65287550b7a626f7