Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e78f6837c7612f…

MALICIOUS

PDF

73.6 KB Created: 2021-05-18 08:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3bd5147de89b2fa1fbf3594f03702a27 SHA-1: 55cbdcc8b891200a4674fe3ec9e6784964f04481 SHA-256: d0e78f6837c7612fca4ba4ec6042e3dd80b963600e8547cb667072b7ef005eef
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+to+reset+central+ac+compressor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368501/normal_603e1a8320faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487665/normal_6017be2818907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd86a2f73b81.pdfIn PDF document text
    • http://kirivil.iblogger.org/winixotomidupowekaduresun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_60212a4588cc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_601f554d97fa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483842/normal_5ffed0175f84b.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/711102.pdfIn PDF document text
    • https://zojobowexiwe.weebly.com/uploads/1/3/1/3/131380894/jazefibege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_60549e1c49050.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/tuxenipup/71433240703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86918818-bbec-49bd-9e07-6faffbf6ecaf/how_to_connect_my_jawbone_bluetooth.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/dupene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206bec48-ada9-4db0-9775-2026da9e8a22/realtek_ac97_audio_driver_windows_7_ultimate_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14d91b0-909d-408d-97a9-4e0993a9b342/hp_probook_6560b_i3_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0281e4a9-b69e-4d88-9856-faac27574c10/ps4_gta_5_code.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/how_to_operate_lg_top_load_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/53311356942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7a7294-9253-4f0b-9ed2-4b82b73f7a6a/chemical_engineering_lab_report_example.pdfIn PDF document text
    • http://sulojigemijat.rf.gd/3647101213.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_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 5132 bytes
SHA-256: eddea7738bde3c79fd90422786a533cdcc1298b92a39947f743379425e98b80a
font_01_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 10712 bytes
SHA-256: 92205111d1f8be0ea47a7a19a57f29dbbb6031d6fd9a68ce99ef3d22a8ff4c4e

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