Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b1d256fe62a576…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 02:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8f2f694e64c01c39b109aedffb2dc076 SHA-1: 1dc819d98e796fac99606f5020820f0a93eb222d SHA-256: 26b1d256fe62a57698c7f0304e7f91caf482b6ea3cba1c64a1f7755c6b0585be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://htwy.com/upload/file/zepopuverapuvibuverifi.pdf In PDF document text
    • https://warungmimpishio2.com/contents/files/zotuwelilavezebi.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/babalubibunumejexupig.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/66970977364.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pisafabetedukitil.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/kopexalil.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/jotupevovofinum.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/dozejakebojopawexitorife.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/27203903738.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/5236728229.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kozavegevalidinig.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zekumifipamiweweke.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/sizen.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/36609175568.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/rezudigomavofijewasexegef.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/mumafagimovad.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/79979689267.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613849e2a719b---53213053236.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/24570306482.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/58507948792.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///94205345694.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910051902.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/89323343060.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/sosobubaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=our+sexuality+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12E 10608 bytes
SHA-256: 8f1491ad54f4a31ed34d8eddb92c8043da096500eb11ee324b1c033340385531
font_01_sfnt_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 17684 bytes
SHA-256: 02494f4da3f1ad00f988d41eaab7155e85dfb7b0420479124d3276562baa46f7
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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