Malicious PDF — malware analysis report

Static analysis result for SHA-256 940aa459409a58dc…

MALICIOUS

PDF

77.9 KB Created: 2021-05-29 09:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc8962789ce9af61b9bd7b87628af8f3 SHA-1: 9013f211745456b7c116eff25972c5f87f3561a7 SHA-256: 940aa459409a58dcc1cc4af291bf5be9232d273b95c1f4dcd352df9557f25e52
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+setup+hp+photosmart+c4580+wireless PDF link annotation
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/785181.pdfIn PDF document text
    • https://doxidadawod.weebly.com/uploads/1/3/1/3/131379698/kaxariman_xapapaludupele_lowagugafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_60421f9d1b235.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/5252511.pdfIn PDF document text
    • https://tamunalu.weebly.com/uploads/1/3/3/9/133999965/kodatuwupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fd94ca340df7.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/nokanud.pdfIn PDF document text
    • https://nadevakijod.weebly.com/uploads/1/3/4/4/134490940/395035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_601ddd68cc455.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/91c8a545-8dc5-4422-988c-3ce8def390c1/how_to_put_landline_on_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1713f9f-85ca-48d6-b7ae-bffc743a7ffc/97866744455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff017535-f316-4c68-a5f1-d9b4d939baa9/how_long_to_get_results_from_urine_drug_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b78de302-5238-42cd-8a12-78b5cd198795/zalojumofolegag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d3f88b-5811-4790-9cf9-43424a734fe7/53_bank_auto_loan_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d16f631-5a0d-45f1-8a33-dd7445f37e57/wumemunevisobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8f107e-b6a2-41cc-83ff-be4961ca2e9f/12932381084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff7d626-2a5f-4a15-ab72-9af2d2621f54/xeramonobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cb6071-08ce-42c3-8f62-ee38f5044946/how_do_you_get_paid_through_monat.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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 5772 bytes
SHA-256: 92842fcccafa217d088c5aa20398e8133fc294a140621c6a095d9be01c36fcf2
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 12004 bytes
SHA-256: e3743566e1242de2f2767b4e69329848a0bb55c56df90a129cbb21bb3cbf6b5c

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