Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48eea1e80c7a020…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 13:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb68e545db4944e334244c7f20cb5e9c SHA-1: 6feb849294b9142d96e58f3fabfe40fab73b26c7 SHA-256: a48eea1e80c7a0209368c0f9682adce8ca0f27e07ba5e853b3a73fa0e2e46a24
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, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions, and the presence of external URIs indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gioiacompany.net/images/upload/file/19144375649.pdf In PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/zulebezuteb.pdfIn PDF document text
    • http://moneymaker-gold.de/files/94660870302.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/34620255397.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/kosiwagetulen.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/fifadunijupokalaxit.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/lafolawabatonulitebuxax.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/91229683210.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/41377907509.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/94645214886.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f747e3a3---roworasusesinivepemuguru.pdfIn PDF document text
    • https://huanghecables.com/d/files/pogofomodumazonuk.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/jolitos.pdfIn PDF document text
    • http://zgic.ru/!upload/files/61295354590.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/00636d284348f29e5ccaafa90ff72e90/repolofavutakijegikozazil.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/86742558335.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/225806630.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/guligaxodesotepuxanipomo.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/96698212783.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wapikidixuzulefo.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/37411483825.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/37080287219.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/42900437180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mnml+screen+recorder+apkPDF 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_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 10568 bytes
SHA-256: b14cde6e05f296020c1493f8ee17c0dca5848ae4c329e4865fc04b0a6c4c6326
font_01_sfnt_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 19076 bytes
SHA-256: 33d1c821d1d895a9243ff0c780c03d9bcb75947ba62e8a954527651b8dc8e1c7