Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd0e64c24119dd8…

MALICIOUS

PDF

72.4 KB Created: 2021-06-06 15:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb632d874b911ea4582e1ce34aa3c7b3 SHA-1: b37c59ab20e41f8d95303bcdd76284eca7550aeb SHA-256: 1fd0e64c24119dd8d8f31da708f588f0061e60c5bdead31ecaa9994182b6a7f2
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/pbw?utm_term=class+12+chemistry+ncert+book+pdf+download+byju%2527s PDF link annotation
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/konawotagejilugixam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff5a1e777d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_60477b0feb4f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369163/normal_6008dd04e4533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_5fe04fa12fee9.pdfIn PDF document text
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/35ebb34480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_603a7c8a0f845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_602cfdf1a9983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_603e44476460d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_6000c2ca5de45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_6054628b869dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_60ba4a677af01.pdfIn PDF document text
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/xazijudomawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_603335f288410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_604aff069a22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_60468949c86c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_6034c3a0b9ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_605cb1a23bbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6064cc76d6560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5ff49a57d1848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457577/normal_5fdea1483b001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozevupegufi.pbworks.com/f/84782965128.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/nojidejexogosuxax.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/w/file/fetch/144527418/what_day_does_walmart_restock.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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 5992 bytes
SHA-256: 03708ea601b96dcb0a478cd4df130c46a2b9128f2680b9d32cc27879db9227b0
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 10580 bytes
SHA-256: 90bb9c236dab329355ef75467d6898d8507fafb535734410e299ed8822f8fdae