Malicious PDF — malware analysis report

Static analysis result for SHA-256 318a9c91f5d06538…

MALICIOUS

PDF

71.0 KB Created: 2021-02-20 05:11:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b7d280cc8facbd988db29f883ef5f4c SHA-1: 639e78066800a2942dfa0447ecba47d1908d30a1 SHA-256: 318a9c91f5d065382a6692cb0544e877f95fca50323c7567ba685d74f961cc64
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The presence of numerous external links, including one pointing to known malicious infrastructure, strongly suggests a phishing or content-luring attack. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=what%20is%20the%20future%20of%20lsc%20communications In PDF document text
    • https://xisosisudotaju.weebly.com/uploads/1/3/0/7/130738948/raxaluk.pdfIn PDF document text
    • https://zezawimikosalef.weebly.com/uploads/1/3/5/3/135329884/finip.pdfIn PDF document text
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/9eb40e1.pdfIn PDF document text
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/nufaronujulifeg_juvidof_tuvimotanaroda.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/bilusegi.pdfIn PDF document text
    • http://minuzin.22web.org/the_wheel_of_time_audiobooks.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/7239721.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/eliminators_datasheet_40k.pdfIn PDF document text
    • http://zixoridepub.rf.gd/2127189664.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/jufumakorefakusidurokipaz.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/accra_institute_of_technology_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/8869641682.pdfIn PDF document text
    • http://vefibuvusesusu.rf.gd/adam_joan_bgm_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/wenanedanoko.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/bawolubonixixo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/93480004174.pdfIn PDF document text
    • http://jowunimigafej.rf.gd/nogikusamufusilofoluper.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/eclipse_ide_for_centos_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/60595365110.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/property_sales_agency_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/amenaza_de_parto_pretermino_etiologia.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 5136 bytes
SHA-256: bdd272c5146d03e51430ec7a6559e28c63185c70a3f64b048b686076c8050aad
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 11000 bytes
SHA-256: 93b7a073e5ea5ea6eb31a599b8471e7f6758612ef5c148c731f051c103637d59

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