Malicious PDF — malware analysis report

Static analysis result for SHA-256 335e437fc1297882…

MALICIOUS

PDF

82.6 KB Created: 2021-05-14 02:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8c24138c64819a1ee527f74ec92a28a6 SHA-1: 9e0186013589bc2b1f8e1277d6232135e9e4ed46 SHA-256: 335e437fc12978829c52c603526edf78fbf7c0eb4d95bf8b80a1db6d6c1f28e3
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL (https://midufefew.ru/strik?utm_term=...) appearing to be a redirector for a phishing or malware campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=contabilidad+de+costos+un+enfoque+gerencial+carlos+fernando+cuevas+pdf PDF link annotation
    • http://jetelijunejuk.iblogger.org/equivalent_fractions_worksheet_year_2.pdfIn PDF document text
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/43faa.pdfIn PDF document text
    • http://bejavof.22web.org/vm_vsphere_client_5._5.pdfIn PDF document text
    • https://xuwapitevakud.weebly.com/uploads/1/3/2/6/132682402/6460814.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/mokusadorijul-farim-manixeder.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/8127557.pdfIn PDF document text
    • http://tifizutolakefu.22web.org/android_barcode_scanner_api_tutorial.pdfIn PDF document text
    • https://ribigitapupag.weebly.com/uploads/1/3/4/8/134887221/dinureji-gopusizidipowa-vanebibulav-vokoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawisis.rf.gd/gigovudebakiso.pdfIn PDF document text
    • http://tasaroje.epizy.com/additional_maths_past_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426d8b53-6511-426f-8254-5628f8f58a5c/where_is_the_drain_pump_filter_on_a_whirlpool_front_load_washer.pdfIn PDF document text
    • http://vuzomifazezibaj.rf.gd/48761446799.pdfIn PDF document text
    • http://sifepilojiba.rf.gd/hidden_pictures_color.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_d87aedab416c4329bc59831edd35f59a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f361f5c-fa53-45d1-8eb6-178c9ad9959c/adding_and_subtracting_fractions_worksheets_year_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ce6125-234f-44f7-b889-579531d77581/xerol.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_4c1d5bb9021346d78a392b7744e4d693.pdf?index=trueIn 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_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 5552 bytes
SHA-256: d6df8008b775927472ec28a7a4baaf42f39fefa2cba186fa0d525de1a1326233
font_01_sfnt_off00011809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11809 10996 bytes
SHA-256: 13316e54d656b3dd90effa51263f1e17ba1bc38e0d0356ae121f2f5140108dfd

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