Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9fc0feff04830c…

MALICIOUS

PDF

84.3 KB Created: 2021-04-07 09:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38067ec6a29bde51ef1c40e905e81564 SHA-1: 1febe90045c993db0b50fbf27dc43c150673cc22 SHA-256: 9f9fc0feff04830c629fb9a49dec847d5fd0d17ca05966ad552926afe01ed4a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=clasificacion+de+los+numeros+complejos
    • https://salobomuxalevi.weebly.com/uploads/1/3/1/0/131070078/2838841.pdf
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/ec4bcc1ec47220c.pdf
    • https://tisogile.weebly.com/uploads/1/3/4/7/134728595/newofo.pdf
    • https://zuzameponotu.weebly.com/uploads/1/3/1/6/131606203/lefamapowu_toxirasukila.pdf
    • http://jedomagisuw.getenjoyment.net/wiveredezarisesij.pdf
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/jafip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_b82d2ee346a94097a361212b857ff0d6.pdf?index=true
    • https://adea4596-07c4-4c45-ba97-107779ed6dc5.filesusr.com/ugd/5bd9e2_48a94e6d63e64e659b795ae5c577cd37.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e15f49bc-84f1-4971-94f0-cd2d907cde77/40821768524.pdf
    • https://uploads.strikinglycdn.com/files/d8a63683-487a-4dba-94de-c06f53057eb9/65611098598.pdf
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_bc93abee06544f1c9b5c918c65bbdbed.pdf?index=true
    • http://viwuwijagabote.myartsonline.com/what_is_a_valley_pool_table_worth.pdf
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_dcfc57f534fb48aca9d5c179319f8d62.pdf?index=true
    • http://xekapakifujekem.onlinewebshop.net/88866823609.pdf
    • https://s3.amazonaws.com/taturi/giditijawibusuxizo.pdf
    • http://visugog.myartsonline.com/gta_san_andreas_cheat_codes_in_format.pdf
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_c118b5bf9cca4e66917d969d6c15eb35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88b8ceac-2cac-4262-b418-a30c327b8dad/galuzodoja.pdf
    • https://s3.amazonaws.com/fomaralunex/autopsy_report_sample_uk.pdf
    • https://uploads.strikinglycdn.com/files/fe20ada0-aa70-4ca4-a5e8-61e6ed11d08f/midland_x-talker_t10_gmrs_handheld_2-way_radio_set.pdf
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_6f1cbddffaf54047815343e2d68398d8.pdf?index=true
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_29096dbc3ee942a99ca09c6a0bcb1942.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b1f61d8d-3850-4faa-b38b-fb9fc7f4e765/kenmore_elite_he5_gas_dryer_troubleshooting.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_36fc6b5b2015472a9985e7ec48ebb906.pdf?index=true
    • https://s3.amazonaws.com/pugomonapoxuxe/percy_jackson_graphic_novel_set.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70d.bin
4708ec219f280790fdc89b77a41135d67c2f2e2360e1f80b91bdd6a9075e898a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 5280 bytes
font_01_sfnt_off000108a7.bin
6a7feb8ca0b0434f5e4f9a30c894643ea5f85f86a2507beb66c0944a9b837949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 6280 bytes
font_02_sfnt_off000117f7.bin
931ae507e7f1dd9a8d1434b6b3576eb91f3505c585f31723563aea50e619ee22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 13248 bytes

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