Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa812bd827b6f006…

MALICIOUS

PDF

78.4 KB Created: 2021-05-01 00:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4ce2c7ab89d55af2e9f635bc52cccbab SHA-1: 9c0320f4036cc549b90ebbfc4c6410a5ea942af7 SHA-256: aa812bd827b6f00636d1e58769ca19877cf6699038aa0733ce2062b119aa6c51
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to create a network of redirecting URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=basic+english+worksheets+ks3 PDF link annotation
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/robegelejumapu-bugobefeduw-livero-wulolafit.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/tofebuvagigafixexof.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/56427266203.pdfIn PDF document text
    • https://donobemibuv.weebly.com/uploads/1/3/4/5/134512533/9949868.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/a461008cc140dd.pdfIn PDF document text
    • http://surupumigo.mypressonline.com/all_important_days_and_themes_2020.pdfIn PDF document text
    • http://raponikidosal.getenjoyment.net/nexasisejojidibepelovuko.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/6052272171.pdfIn PDF document text
    • http://lozolupamo.mypressonline.com/putaxikekuzonuwawisi.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/58372918692.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/bruneaux_art_of_noise.pdfIn PDF document text
    • https://wasexakenisopi.weebly.com/uploads/1/3/5/9/135982815/bukifasu.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/74145051669.pdfIn PDF document text
    • http://dasazopemobor.mywebcommunity.org/1733048364.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopamebedozupux.epizy.com/ruvozexewiz.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a1ca73568e1a4459aea3ce49f3d8e857.pdf?index=trueIn PDF document text
    • http://posikin.myartsonline.com/administracion_de_recursos_humanos_concepto.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_5ffc3783e1974c4ba71c1d1f9c882cf0.pdf?index=trueIn PDF document text
    • http://fadudenomo.onlinewebshop.net/abrsm_piano_grade_4_scales.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/gitav.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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5432 bytes
SHA-256: f68dc35d1f5fd1a4a5aef6a1fc7ebd892d242b4fdcf209aa71bec6bc3f348120
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 11156 bytes
SHA-256: 6f65e9625b0e7a8f316d556085802ca3f0b6b08efc9a1a23650d7475927ffa4b

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