Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ea5f862aaf7f84…

MALICIOUS

PDF

70.2 KB Created: 2021-06-04 23:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e9250946175aa7189eac3781d79aeb8 SHA-1: 2748fde9ed45b422b955f3c3ebe8f1c4f2fa71a8 SHA-256: 98ea5f862aaf7f8401f8ce4bc4d65d295122c2ec92b4808f72e261a1759b180e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to other PDF documents hosted on various domains, many of which appear to be disposable. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://smidgel.ru/pbw?utm_term=punctuation+worksheets+for+3+grade PDF link annotation
    • https://bififofivajarat.weebly.com/uploads/1/3/4/3/134315789/72473a93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_5ff9b36db701f.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/6393200.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/66c4faa6.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/dakeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374978/normal_5fcd0bccd9367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_60214fa79e937.pdfIn PDF document text
    • https://lurabokeriwima.weebly.com/uploads/1/3/7/5/137511490/todebu.pdfIn PDF document text
    • https://lakafirawitekir.weebly.com/uploads/1/3/4/0/134018328/1324148.pdfIn PDF document text
    • https://tazesudi.weebly.com/uploads/1/3/0/9/130969012/lezibun_sipepa_rexisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_6060372decf6c.pdfIn PDF document text
    • https://pudamokanijufe.weebly.com/uploads/1/3/4/5/134524046/kejirujufuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_604cd346b5b60.pdfIn PDF document text
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/26d5ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisagexal.pbworks.com/f/24019059634.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/tizojasejawenakasupipidez.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/what_is_soda_lime_glass_made_of.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/22652409269.pdfIn PDF document text
    • http://popuwepux.pbworks.com/w/file/fetch/144588738/ver_helena_de_troya_online_latino.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/adobe_audition_1.5_free_download_full_windows_7.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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 5572 bytes
SHA-256: f65dfb2823cd2458016d2a47cedf8268cad3623bbc4fce0a8f2ea281155a7f2e
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 11084 bytes
SHA-256: 798c1b7684c7c49f3d84884ae182e67ef668e80415020b18fc54a1ce054d8c4a

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