Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d682646bf71f7d…

MALICIOUS

PDF

87.6 KB Created: 2021-02-27 09:40:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 428eff1ba345272a0fa0cf4309b03b55 SHA-1: 8142935161ef4f383ec736081e0fb5421716afb7 SHA-256: e9d682646bf71f7d1944274e78ae8557e3e89628900d9f1a751c21b7876fa32f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=f+major+scale+violin+finger+chart PDF link annotation
    • https://rejawezegevipi.weebly.com/uploads/1/3/1/4/131437848/wuwobi_rumemesujufuguw.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/b3df32350.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/what_is_considered_direct_democracy_government.pdfIn PDF document text
    • http://meetchat.space/superlative_activities_worksheets2twe9.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/darofakigojozudinoki.pdfIn PDF document text
    • http://covid-19online.site/ecmo_circuit_priming_guidelinem71jq.pdfIn PDF document text
    • http://arendaavto.taxi/washington_state_coronavirus_vaccine_phase_2r6wuw.pdfIn PDF document text
    • http://successinyourlif.website/bosch_spark_plugs_cataloguea659k.pdfIn PDF document text
    • http://storeeuro.info/java_64_bit_ziptiypn.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/fivuvajit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/line_6_pod_ux2_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/31141443730.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/97764070875.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/alkaline_forming_foods.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 3416 bytes
SHA-256: a0c5e382ffa32308d156dd504dbff3409e0cb86969da9d5ce95f31a09b0f35d0
font_01_sfnt_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 5384 bytes
SHA-256: 675d325766e126a55885d79a2589d23e11126625033e466d5eeb5792d222c798
font_02_sfnt_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 13284 bytes
SHA-256: 2940e1b2286ff8a1f25ef7374da492c7c7b2fa49956fb73aca5d1bc0afe748bc
font_03_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_04_sfnt_off00014111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14111 6096 bytes
SHA-256: 5a2d572afb3c570374270fae547af810d53c516b5418a0dfcd2eb6c0bb28c9fe

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