Malicious PDF — malware analysis report

Static analysis result for SHA-256 181b25b625e4248a…

MALICIOUS

PDF

72.1 KB Created: 2021-04-04 11:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 224c0c53db0575aed447848470f3866e SHA-1: eb8a7dc2941d967d25eb3de2b9b5857adb03db53 SHA-256: 181b25b625e4248aa35339772b00036e14b95081f11f9873b9e50f0c20877746
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

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://leonvi.ru/123?utm_term=alias+outlook+android PDF link annotation
    • http://folejaf.mypressonline.com/how_to_calibrate_cen-tech_infrared_thermometer.pdfIn PDF document text
    • http://vkysnaya-eda.site/escala_likert_enfermeriao1uzc.pdfIn PDF document text
    • http://trikotoria.ru/can_i_negotiate_rent_in_nycn4aql.pdfIn PDF document text
    • http://canonsburglake.org/kefatekemoxitesupopcvf0.pdfIn PDF document text
    • http://tadefog.medianewsonline.com/89387456864.pdfIn PDF document text
    • http://lerimofo.mywebcommunity.org/the_beatles_complete_scores_gratis.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/how_to_write_a_good_personal_story.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/cuisinart_extreme_brew_replacement_parts.pdfIn PDF document text
    • http://tameeniraq.com/compare_and_contrast_essay_outlineso109.pdfIn PDF document text
    • http://sell-toclick.online/17565398959lsay9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35bd412-972b-4454-9cb7-dfe56d7d3fca/38308097279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe71f70-303e-4444-a45a-cb780401fea5/where_can_i_find_my_computers_ip_address_on_windows_7.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/arduino_espaol.pdfIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_2874f092fa234d9eac86c6f79128368c.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_cfca0462d1bb4ac29b635d41619fcb66.pdf?index=trueIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_b28a4e9218494b3eab6080a8dc62a668.pdf?index=trueIn PDF document text
    • http://jujuletofu.onlinewebshop.net/5547644715.pdfIn PDF document text
    • http://xemunebo.atwebpages.com/malezidakutiniwes.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/ap_5131_manual.pdfIn PDF document text
    • http://domuromu.atwebpages.com/manuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce868e1-7c0d-40c6-a1c2-5ad737df6f90/line_6_floor_pod_review.pdfIn PDF document text
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_4cff7e3f746c4415927e318b40c1afb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/559dd4ca-92ab-44a0-be31-0288dae693a6/fakeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1e3c27-ab41-486f-a429-56d88b972311/nidefe.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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 4872 bytes
SHA-256: 56094251657f9893ae91eaae3e388980d1b5a290149c223eee00baef70f80f04
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10900 bytes
SHA-256: 0227b9deadcadd9c5e66261df51bb2e326893b682b33a06523e5211f0408b30c