Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcc5a4ec8aa1944…

MALICIOUS

PDF

81.2 KB Created: 2021-05-19 22:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de352111005a9a64b7b2e5f3827933f4 SHA-1: 2282cba7f28b710b60ede23d8f30335fcfabcdd1 SHA-256: 4dcc5a4ec8aa19440e9acba3014c2498ac4e59a97213318e2e376087f11bf40b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, many of which are designed to redirect to potentially malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://yafferge.ru/strik. The document body, though heavily obfuscated, appears to be a lure related to map printing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=mapamundi+sin+nombres+para+imprimir+a+color In PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/jixisozukufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_6008eb3b8b90e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_6050f1f1000dd.pdfIn PDF document text
    • https://rediwugozuza.weebly.com/uploads/1/3/1/4/131438197/3291899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_60055640d2044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_60545a3f1f875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_6033a3ee0a1d9.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/simavonawa-sufusikeko-sijegulagifugot-feperumesife.pdfIn PDF document text
    • https://tateleref.weebly.com/uploads/1/3/5/3/135322569/kames_nevujimiworuse.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/liluvad/51335584370.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/baldur_s_gate_enhanced_edition_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/67612431871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d8e8d8-2f43-4676-9b47-d5d57df25d4f/is_the_nook_bnrv300_still_supported.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bf37e1-ea4a-40d0-bd38-d149bc9d0f70/how_to_clean_dehydrator_trays.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/81345670748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b5fa25-e341-4176-bf18-e69e5382771a/what_did_carl_gauss_discover.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/project_manager_cv_template_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11811232-6f34-447b-b053-bfb216d3ede1/buvanadatenafitijukon.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/42754835124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5a169c-800b-4e49-85ee-a8e6d319c091/dobafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6ff852-9582-4404-aa5e-66bfe54a6e63/nigebasotudiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0586ccb0-4497-414a-881b-f96452beb457/83537361061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a33469-703c-4d31-906c-fc3b5c6624e0/wekuviwevaneke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6720b846-e953-4593-bdbf-ca3a07545ffd/90059013546.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/34542627698.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 5364 bytes
SHA-256: b89ebf50d2c9fe4879dd0821da42959e686dff29f2acb85e4585834ccb16f005
font_02_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 1932 bytes
SHA-256: 79146b382a30d57b86cd31aee382fdde8e94a7721889692ffed962feefcb06eb
font_03_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 11520 bytes
SHA-256: 822f4c9b00b036154357fe2f5eff1b6ee2d8664ce6c8b88cdb7ec1626033f646

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