Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc02be7f10dd341…

MALICIOUS

PDF

78.3 KB Created: 2021-05-27 06:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fe3a01fb92f43b6611f11042a8baad69 SHA-1: 59ebeb59f51c6979315ce6300709aa1315af659b SHA-256: 0fc02be7f10dd341932089f41fb9b72b8ed605f825339754e0290fa7196ebc40
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, appears to be a lure related to a 'Culligan n8 custom water softener manual'. The primary malicious indicator is the external URI pointing to 'https://pelibifir.ru/strik', which is likely used for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitated the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://pelibifir.ru/strik?utm_term=culligan+n8+custom+water+softener+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420019/normal_5fe9b0d947b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_5fe44a1ddac52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_6037ec827f1d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/241c1a5c-ea2e-4016-9ff3-06d33cfa009d/how_to_troubleshoot_roomba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6af47cc-3306-4c1a-814f-4a0337a0ae82/how_to_fix_soft_close_toilet_seat_caroma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01dcd028-d5c7-4ac9-8c09-8ead58d63464/grammar_exercises_verb_tenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e35f28-bde7-4c69-90eb-cac7947d41f7/how_to_put_together_a_contoured_tension_pole_shower_caddy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00077e34-9522-48ae-97e3-a3acb85cdbb3/13414646843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b9ffb0-6916-4760-9464-9a799c87c921/wipekenukisejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce1ca7d3-0d39-4950-8fa9-eb41f7a1b264/faduloke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22137d30-1d2e-43e0-9a76-2bc93758025c/nubolufepuxuxigelisox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3490f264-bcf2-4b60-a852-a74fc01fcb05/24393345774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793afc87-2468-4709-a240-09e88d931dd6/saxijoranirefogame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa69ed5-c9fe-4957-bc1d-da12c441d0b4/walmart_pharmacy_refill_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d164f00-5754-4386-8b44-f58d63a39c49/basawemozubiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2d442f5-b5d1-455f-99f7-47e9e8aa4bf0/unity_c_cheat_sheet_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970379bd-93ca-47e3-87a9-507f450cca34/tozixola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1950bd43-2e7f-425b-a9f6-ecadc207c7f1/vuzibilepovirazibetuwotod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08c55c1-d2d2-4eb4-816d-5936a4e0dec4/37816199381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4d5753-682b-4d93-a983-764269400b2b/wufexisanowamajadifiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83588f1c-a7d3-47ad-9c5a-e774bb9e44f9/does_comcast_have_a_landline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650e4bbb-b12a-4002-b00f-686c739bc49e/does_a_run_of_3_count_in_cribbage.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_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 5392 bytes
SHA-256: c327595d74be9cbf5fef17fc63e125d8090f0157da4f1ab69813a3c322243698
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 10676 bytes
SHA-256: 53d84d566863a66686f38d34a4332c7de576ca82680eac7aea6544e7eecfa452

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