Malicious PDF — malware analysis report

Static analysis result for SHA-256 814081caecf1c986…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 09:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e235a68ae4ee462756f2f678d23cd8a7 SHA-1: a0051eae8bea49654cc4b8cc09bcc90ea42851d6 SHA-256: 814081caecf1c9868d3d00199a86db0b16ce76b56b0519ae5f3b0b086105693b
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm hosted on disposable domains. This technique is commonly used to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=printable+reading+worksheets+for+kindergarten+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425483/normal_602aa9514e4f2.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/56335061762.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/ladelofusiwilumubilavutel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_5fda31f5c63bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_60321a235d0cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_6007279dd8742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_60112d09ad651.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/fomex.pdfIn PDF document text
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/pazuxifuja.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/sakarisowakigor.pdfIn PDF document text
    • http://gepavozo.mygamesonline.org/biological_materials_science.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/hbJTShc/jabenir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451950/normal_6015a1684084a.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/Uidijhc/stickman_ragdoll_games_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_601f5fa9ac6b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_604a65ce996e6.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/act_and_rule_utilitarianism.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/4269f7c0-59d1-4c59-9afd-2a223d12ef28/vanamukuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61dd3d06-3d57-4a3e-b4ad-1332c4f697dc/fakufunobetus.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_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 5600 bytes
SHA-256: bec12eb11fdb832607a0e1d9eabb2d71bdabc96d137999332f5e2d98e4ca16fb
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 10900 bytes
SHA-256: 51bf8ab142f21707f526c7b48315aa21686bab465020f087147bb54d08336a2e

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