Malicious PDF — malware analysis report

Static analysis result for SHA-256 f501ac3850eea470…

MALICIOUS

PDF

75.3 KB Created: 2021-03-28 12:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a177ce1f6d3ff3fa3a55846b379483d SHA-1: b140d73a2f5b0485f3695af0db4bc90556526de6 SHA-256: f501ac3850eea4708d963aea164a8b94b981f415f04ef401845d46efc37a698d
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 0.9997

Heuristics 6

  • 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 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://nipisod.ru/123?utm_term=free++busybox+pro+terbaru PDF link annotation
    • http://mumolazesinidix.getenjoyment.net/35266412044.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/xowoxola.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/cihjoha/learn_farm_animals_names_and_sounds.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/vacuum_die_casting_process.pdfIn PDF document text
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/nusenokunobonopoj.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/hf4OMgj/stickman_falling_mod_apk_revdl.pdfIn PDF document text
    • https://wexisuteki.weebly.com/uploads/1/3/4/6/134616275/62cf63e1a.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/ha1eha8/5394814347.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/01015.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/felemunevofowodadotox.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/biblia_gratis_reina_valera.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/apsa_80_uses.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/b2bc0b1c-5d18-4497-bb82-81b21f5f977d/5171166779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e482f6f5-b13e-4e24-aba0-3800f6475952/how_to_find_sum_of_interior_angles_of_a_pentagon.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/pdf_para_word_programa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e359511-78ff-474d-bf3c-41b4b581b0e0/do_you_get_paid_for_appearing_on_judge_judy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c432b33-2b4b-48ac-a1e7-d8759202edcb/writing_practice_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a768775-f9d6-47d0-8f61-0940618e380f/aprilaire_600_humidifier_installation_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c938855e-c352-48b5-9d8c-7187d98773a1/61232546447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/582d85dd-17b0-44f5-b375-cbdb461be95d/5477088883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a1cf0cc-e9d1-4b87-a45f-b59e40fec7d9/what_does_theory_of_punctuated_equilibrium_mean.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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 5044 bytes
SHA-256: f3e56eee5810f67e38d225b8b0cd7040bac6d2cba456b27e67f380c2dcc16d92
font_01_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 11340 bytes
SHA-256: 3e3975173c6fa93eb3df5d3d4a12e5df0d9173df4d06ada740b967333ab46e7e