Malicious PDF — malware analysis report

Static analysis result for SHA-256 572bf35587260d2d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-10 01:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bfa7d25d9ed8306450297e2525f5be36 SHA-1: 40cbe677e5e16a8fd34dcc94f99ee767f479d47a SHA-256: 572bf35587260d2d1aabfe92ca03b091249d95d791446ea9bc3542567f9495ec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=new%20ceqa%20guidelines%202019 PDF link annotation
    • http://eferevole.com/taraweeh_ki_namaz_ka_tarika08in8.pdfIn PDF document text
    • http://iranianvc.com/toon_blast_game_cheatsdc99i.pdfIn PDF document text
    • http://ultra0.space/60734502198w136j.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/hVmihzQ/zexebaniziba.pdfIn PDF document text
    • http://ionatr.space/most_highly_absorbable_form_of_magnesiumw9wvs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415519/normal_600804c6f4201.pdfIn PDF document text
    • https://cdn.sqhk.co/nupepewomaxu/jcEiAcm/tv_serial_photos_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/yhcihfQ/31468310893.pdfIn PDF document text
    • https://daxigowopijadek.weebly.com/uploads/1/3/0/8/130814785/4d4224259e00ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/3ghG0hh/robagelegifi.pdfIn PDF document text
    • https://cdn.sqhk.co/mozejipakas/hhYTFif/gupora.pdfIn PDF document text
    • http://ryukzak.digital/46226611960g6qb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://napubuxuwel.epizy.com/diesel_denim_size_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 5372 bytes
SHA-256: 3cfe4837f7d323d67bfc4b1b116d1c002fe0e233577a66a1bf20f2ff26751713
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 10824 bytes
SHA-256: ee4bbb64bc6b3f769d7c9c5eff6cc8b1e3e689413b4f74f3de0122e64dabca73
font_02_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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