Malicious PDF — malware analysis report

Static analysis result for SHA-256 594ca15c9b29a221…

MALICIOUS

PDF

75.8 KB Created: 2021-04-07 06:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d320ac253d534a635f4990445d38da2 SHA-1: d64b467dccbb4a75d8d53c5456a3e2f87d896e25 SHA-256: 594ca15c9b29a221d6f862df4a9c2355877cf053d2ed09144254a320bc68217c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://nipisod.ru/strik?utm_term=monster+vape+tank, which is likely used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nipisod.ru/strik?utm_term=monster+vape+tank
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulujono/ragnarok_m_eternal_love_fast_leveling_guide.pdf
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_02a900f70952473b8dbf4a01e974d311.pdf?index=true
    • https://s3.amazonaws.com/voxulija/50637164818.pdf
    • https://s3.amazonaws.com/fujadabez/26715666285.pdf
    • https://s3.amazonaws.com/tobojelusiwi/lawowuboxuwekewawajeruna.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_2e19817970dc40628540984f5223f911.pdf?index=true
    • https://s3.amazonaws.com/guxosa/payroll_system_project.pdf
    • https://s3.amazonaws.com/wiwuxot/lodufigibutigut.pdf
    • https://s3.amazonaws.com/fazujo/tavimegewumogera.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_8c9278d631d54bcfbdf7775c8e5c56ff.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_59fcfe7bc18a4aad8af2178788e7ecb8.pdf?index=true
    • https://s3.amazonaws.com/rurovikejigibu/arma_2_balkan_war_mod.pdf
    • https://s3.amazonaws.com/libeganot/four_types_of_memos.pdf
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_21f0717d6fb6422faca8e26b00589cea.pdf?index=true
    • https://s3.amazonaws.com/netinuwa/music_video_creator_free.pdf
    • https://uploads.strikinglycdn.com/files/c92a519c-a4dd-4b01-a920-6eef41ea47dc/bushnell_voyager_telescope_model_78-9440.pdf
    • https://s3.amazonaws.com/baxunaf/electro_galvanized_sheet_steel.pdf
    • https://s3.amazonaws.com/poresi/anesthesiologist_education_requirements_and_career_information.pdf
    • https://uploads.strikinglycdn.com/files/33bf33f8-5205-4694-b760-8791042b964d/quantitative_equity_portfolio_management_modern_techniques_and_applications_second_edition.pdf
    • https://s3.amazonaws.com/vuzotisenixava/wuvotekuvogiz.pdf
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_b6e3a78ee26a4f43b3f99cba3be82500.pdf?index=true
    • https://s3.amazonaws.com/xeropizuwe/gozerep.pdf
    • https://uploads.strikinglycdn.com/files/926ae1fb-5625-49f6-9681-0ca2dd6c2f37/tezalunutasefutuwenobev.pdf
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_73c54d1cdb074588bfe0d031b5905a80.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d33b511c-2175-4b5a-b27b-2f9ee3c68e05/kejenakedabula.pdf
    • https://uploads.strikinglycdn.com/files/a4243663-239d-45c1-a9d8-2f226cd3ddef/natamifavirus.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb73.bin
cc1efa0e9cd86cd1547f9829390159778dce2140fdb864f82a94b7ea346f8cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 4912 bytes
font_01_sfnt_off0000fc49.bin
7caa28437a40f82081762ec7aedff1ccda9fd94227e737d954845048a75a2efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 10796 bytes

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