Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4d62190b7c2d1f…

MALICIOUS

PDF

99.9 KB Created: 2021-04-04 10:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22fbdf1bfa8fd4c012b42600ee83695a SHA-1: f7a7e75e71b13de25b3edd6ddd4a78cf80bba68b SHA-256: 5e4d62190b7c2d1fcc17238d986639b2fd7e364a449483a194914afcc5e28f81
186 Risk Score

Malware Insights

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

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 0.9988

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://fokemale.ru/strik?utm_term=hound+of+the+baskervilles+setting+extract PDF link annotation
    • https://cdn.sqhk.co/givefugonuw/pgjZVcD/kidodeporixanos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_603219f935ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_60693a519dcda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5fe1969a8594f.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/ghRIHy9/free_muscle_car_sound_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/EEjcuFv/gofabiwadelexo.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/fjeMKqk/87354071836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5ff97d42c10fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_6009fb66c3052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_6021968b670e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ff3f1d7b9a26.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/sYqbigZ/7088741482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418590/normal_5fee89c0b864c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6021a386049d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_603936099cf84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fcf42acd34e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_604a7c31dfd5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_edda8bf95826452cbabfe67127ffa133.pdf?index=trueIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_4c6eaab30a9e4cdcaa16121f08d79a69.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_7c7c51cbf7c14fd29ee6200bc11a8f6e.pdf?index=trueIn PDF document text
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_70b71d59234b43908d3f0434b59c1673.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_6a39cea0854648a0a4bbc9bb549df801.pdf?index=trueIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_0f9438d135f84e798b44281766daa6d4.pdf?index=trueIn PDF document text
    • https://a16eeaf1-ab09-4fb7-bdbc-3ebfa24c279d.filesusr.com/ugd/03042f_c47aa04c55e143d1a424ef8af2209e59.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_0d7ad641f4374144ab4cbe4ca2aec604.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 5416 bytes
SHA-256: 6713b5fe09345162675c0120db67397f816acaf07781eda6ef3e5bb30e20a4b5
font_01_sfnt_off00014172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14172 5576 bytes
SHA-256: 634880d0120fbc611c0e136ad2e12a547f5bad0a5c6b2ef2d056e900f31a082f
font_02_sfnt_off00015469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 14420 bytes
SHA-256: b11eaa2b65f3f24ac41aa115281cc60113b19afdd0bc750beb30e5e9ff6d3e38