Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13bc5eee8332214…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 09:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcea04d6e6ae1ef6c38f8b83e32bc535 SHA-1: 635773080785a4b74573c8c9f56697eed1f20408 SHA-256: e13bc5eee8332214eb9f46cccc41fd5dfff8c5817f0cdd492922f18f4d962531
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://associazionemusicaviva.it/uploads/file/jaxerulej.pdf In PDF document text
    • http://flyingwedge.com/uploads/assets/file/87052587059.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/86490802711.pdfIn PDF document text
    • http://contua.org/userfiles/file/43726506121.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439edb7c516---25795334861.pdfIn PDF document text
    • http://djapm.com/userfiles/file/puwidojilijenezokovarovis.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/61104653437.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/lulegupo.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/51148980664.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/44663794163.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631944845.pdfIn PDF document text
    • https://tsegypt.com/file/10095962304.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/18585144588.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f212f55d6a---44903426755.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/21541615738.pdfIn PDF document text
    • http://irths.com/upload_files/files/22696998620.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/nudegexufuvuvo.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/60553195684.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/15449464407.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jakagewalugexir.pdfIn PDF document text
    • https://vendax.ro/files/file/vodegaxi.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/83318942554.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/wizubijemakewalagikutulut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=instal+among+usPDF 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_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 15508 bytes
SHA-256: 377ad1e443427b6c12026f03c9ad0501b1770b48f2212d82e1ee199b4ccbeec0
font_02_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10180 bytes
SHA-256: c786afb49aeef22a237a57921f4574e4a1ad83ea2131f3ea0fee3fe5611ab614

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