Malicious PDF — malware analysis report

Static analysis result for SHA-256 8544328fa7d654e0…

MALICIOUS

PDF

77.5 KB Created: 2021-04-07 22:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 17100bd131d40cf7aa6dbd50b98a6196 SHA-1: d8ebf62663bea4dfbd0c51940c9199fff5d47b18 SHA-256: 8544328fa7d654e03e1171829784f74ad311cf07c0b2a2ee300d35d5845fbf14
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm intended to direct users to potentially malicious content. One prominent URL, https://midufefew.ru/strik?utm_term=how+safe+are+vent+free+gas+logs, is flagged as suspicious and likely leads to a phishing or malware distribution site. 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 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.
  • 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=how+safe+are+vent+free+gas+logs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373281/normal_6011e1d94c849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_5fd8306f77476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_6011ae25aa24a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_6066d622bf71f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_60551de385a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_60649aedd125e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498801/normal_5fedbf59ba6bf.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/tifuwuw/conduit_bending_guide_ideal.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_8e21b55a40a6419abe5d9cda917a623f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/netbeans_android_plugin_install.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_8bae9ef7178f45f296e61ff4b799a16a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/puxanojosoxoxub.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/96739381191.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/pallet_truck_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/abnormal_uterine_bleeding_canadian_guidelines.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_e1b5202e043044faa84c9cb5e6eafa10.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_79fda323403748568c5393f417c56853.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/tawil.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/examples_of_archfey_patrons.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_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5048 bytes
SHA-256: 18b927878df8b9e12f83ee07491ded561cc81513324ff546c766ab608f13e1bf
font_01_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 11312 bytes
SHA-256: 58ad5face4a6f7211d12a3cf95afed951d921385663b958a60d04b1a2c7e3bd1

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