Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a68aa54b5a1cede…

MALICIOUS

PDF

89.0 KB Created: 2021-05-20 01:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dd45af69ab0d90e232f20b5677139767 SHA-1: cb5f43be7d8f99f26e9d9190fcdd73c2769eacfb SHA-256: 3a68aa54b5a1cede160f49192199b0625817857688c55ba119e14d2992f9387c
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 0.9996

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://resalured.ru/strik?utm_term=ejercicios+de+sinonimos+y+antonimos+para+secundaria+online PDF link annotation
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/c860be99e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5ff66bef8f763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_60086afcb5f25.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/sapekoxalax_fegokafabituf_farewit_jonawufisisugez.pdfIn PDF document text
    • https://gamiwejejorar.weebly.com/uploads/1/3/4/4/134498461/revosurubot.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/loxuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_6027272ca6a84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_605b657c0c884.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/6380ff26-7f86-4a36-9827-651ea2515bbd/sims_3_world_adventures_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f01bf1-9449-41fa-967e-a5c28c90a0f5/python_for_beginners_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/scratch_installer_1._4_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dbe8b6-9505-46d5-ac03-b2b65a4458fe/kotler_marketing_management_16th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352b6852-0bfe-4ce9-b89f-7b39b22434a4/24255810167.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/fmcg_area_sales_manager_jobs_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498a2b6e-ed1a-470e-b4a6-ff2564edb981/pefixiwavusutig.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/tarugetifujatagozajeban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f350df-1698-4458-90e1-4cb79e69b300/what_is_the_coldest_place_on_the_planet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be676f8-abed-40d0-84f1-09cee69371e3/dewalt_dws780-gb_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a49e57-76fe-45ca-a42b-de8f80facbe0/how_to_assign_weights_in_excel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 3568 bytes
SHA-256: fccee19e02f4f8c78ad15ca1bf713d186e55a0e81cd0ea37d492334b2203c22b
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 5356 bytes
SHA-256: 534fd74d446717f099919f63e289af4ee8bec5b410bf3a739493267eae175bc6
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 14180 bytes
SHA-256: c4f1c9b7934f5069211b9cb26ecdc9dcc930797a5d9e282434c4242f559a0f24
font_03_sfnt_off00013ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE9 16124 bytes
SHA-256: 073dee480399a0a44f59834a72d2ef372219071628d3787cc95d902351e1adc0