Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2d2dfee277bacf…

MALICIOUS

PDF

96.2 KB Created: 2021-05-30 19:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e9c217539d2c6b559d60e49b763806cf SHA-1: dd5a7b9da3fd4dfa32678126870ff8d15a152d08 SHA-256: be2d2dfee277bacfede107ebf44da150715bf3207e8deb8c8e666d9443d4cfc1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to distribute further malicious content or phishing lures. The document body, though heavily obfuscated, appears to reference a worksheet answer key, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=dna+structure+worksheet+answers+section+10-2+review PDF link annotation
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/9de6099695042e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495839/normal_5fc8f2a140ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6061a142d4025.pdfIn PDF document text
    • https://luketekovagitor.weebly.com/uploads/1/3/4/2/134236109/polaluxutin.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/koxudifurojise-mamogidimiv-datemuvaju.pdfIn PDF document text
    • https://dagevonedil.weebly.com/uploads/1/3/4/7/134736192/rovotuxubadizupi.pdfIn PDF document text
    • https://luzodogapop.weebly.com/uploads/1/3/4/2/134265842/3b121decaf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5fe7836979721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6043438088d70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5fcae65759d4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_6033ec8dba939.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/konofiweroxunam_saximelepi_wugedubiw_kemabizi.pdfIn PDF document text
    • https://rugajasaxi.weebly.com/uploads/1/3/4/0/134096424/pibene.pdfIn PDF document text
    • https://vokajaxu.weebly.com/uploads/1/3/7/5/137511102/4882115.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/3017329.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/02d95f68c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_6047f67623a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fffd6a1a008a.pdfIn PDF document text
    • https://padotugaladod.weebly.com/uploads/1/3/4/6/134615244/kakewaxiguk-merofe-dixabubidi.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/jezeniziwovajasit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445871/normal_601e93e53f436.pdfIn PDF document text
    • https://tiseparalav.weebly.com/uploads/1/3/4/7/134735838/6139036.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/caef9d1b-845c-4644-8f69-58364e204d25/25330382067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209e77a4-57e8-44cb-844f-a9dcfeddf682/nazm_hikmet_iirlerinin_hikayesi.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_off000138b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B2 5428 bytes
SHA-256: b217810b99092ccb0af54905408f76b1cfef276e1506a3b840b8c107c8d80ffc
font_01_sfnt_off00014b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B54 11580 bytes
SHA-256: 77eb3957b70a0709273364ea64f59e6873cd40239b7c43e531969f07fcff657a