Malicious PDF — malware analysis report

Static analysis result for SHA-256 62eca303f88705c9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 08:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d6186c366685bab47db9755c312127e SHA-1: 9575e7ce0a0d48a3183785071deefb070e8e8818 SHA-256: 62eca303f88705c9057edc7445e6fec2142485aa751fd3ea62608545ddf473ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of these links being used for malicious purposes, such as phishing or malware distribution. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dokemamezapolaluxawugogar.pdf In PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/30170876780.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/52805896441.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/81706207783.pdfIn PDF document text
    • http://centrons.com/uploaded/file/14071944576147850f8d9c7.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/12593014465.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/powamarixutirijaretoneb.pdfIn PDF document text
    • http://xn-----6kcftbqgtghjv5bf5gydg7b.xn--p1ai/files/files/98591796870.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58206629948.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/61772466259.pdfIn PDF document text
    • https://raghuvirtrading.com/userfiles/file/rojanij.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/pivuka.pdfIn PDF document text
    • http://salkim.com/userfiles/file/26523453691.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/5463102558.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/2631764381.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/denujaxavaxetopobusadex.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/guwojaxumavu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/goxidak.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/19259387954.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/riwibobogakomuguzinekik.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/17613821740.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210915230209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=use+phone+as+microphone+bluetoothPDF 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_off0000b205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB205 10888 bytes
SHA-256: 6faf9beaa3daaece172bff49576d437aa0afc6ef45a984daeabe967a0136a0f6
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 17324 bytes
SHA-256: 7d7c65c4a06687a0614978f237614d6b7c18edd29237a579c5ed4ed5300a70f6
font_02_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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