Malicious PDF — malware analysis report

Static analysis result for SHA-256 340fa2790ca14d03…

MALICIOUS

PDF

71.5 KB Created: 2021-05-24 05:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c199f1f75a50a3a8457b3bfb86faca6 SHA-1: 21a09e227f45d4f369d659c441fb3088e814f4c2 SHA-256: 340fa2790ca14d03286e9d7a1320c4de04f235f167332b943b3a2c6bf25aea1c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://mezovuduw.ru/strik?utm_term=how+to+turn+off+alarm+on+hyundai+elantra', is likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, possibly to redirect users to malicious sites.

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://mezovuduw.ru/strik?utm_term=how+to+turn+off+alarm+on+hyundai+elantra PDF link annotation
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/judipiwola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fd812cb875a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_6039069d9af72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fd185ac2741a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_60432e9248683.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/7635a5f142d.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/tujolajonuw_dekapol_gajenisiguwoso_vitetepugewena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_603a5d75d0dfc.pdfIn PDF document text
    • https://pudufanosi.weebly.com/uploads/1/3/4/3/134324904/3821518.pdfIn PDF document text
    • https://gusinunizu.weebly.com/uploads/1/3/4/3/134380178/molexibatupugid_gexitibononod_sisijag_xegejoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_5fe90206f2048.pdfIn PDF document text
    • https://duririsi.weebly.com/uploads/1/3/4/0/134096382/1989917.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/06b6d.pdfIn PDF document text
    • https://vimumigejanamim.weebly.com/uploads/1/3/4/6/134619591/wipovopulisogo-wirudukiz.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/didowugorokirug/macbeth_act_1_scene_2_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdda8188-e995-4de0-b893-12db200c180c/how_to_teach_narrative_text_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/derwent_london_plc_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/967b47ac-7075-409b-8150-b746b78bd349/lexus_rx_350l_interior_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f79cdd-8ade-44e7-be1c-2e303d096e1a/comparative_and_superlative_adjectives_and_adverbs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/pefigimenap.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/sql_server_2008_r2_iso_free.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 5124 bytes
SHA-256: 002bb764e778161f42487562ee17caceec678d97a1ff6007188aadc1adb89abc
font_01_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 10724 bytes
SHA-256: 3d40c8fc4f5993a39c03864a4d684c0175bed30e628dbcd49971a937857fe814