Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87bf864f4eef680…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 11:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 085f243d5b398e9fb3ad64fda8582a17 SHA-1: 9b4b5fc4bd2f0db3db06d840888870fa5b535813 SHA-256: e87bf864f4eef680fe25fa09b8fd6a43dd0dc82c6c4a91cc4613ea807763b2cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. It also features numerous external URIs, many of which point to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prograsifkalip.com/files/12423769182.pdf In PDF document text
    • http://insuralead.com/userfiles/file/73669496328.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/bavobivufexuzebigexu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/17742846789.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/fiwunesoremiz.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/xakubunelefab.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/29622372429.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/moguw.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/19859143139.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/59285749261.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/83308009419.pdfIn PDF document text
    • http://salwex.hu/file/18086081006.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/wubiramubelejuveliwip.pdfIn PDF document text
    • http://c-amc.com/upload/files/vafasaxenop.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/96971782333.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/61539871410.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/62709304177.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/93370645360.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/tafisolotesonesuf.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/xenadupipekulewalexejoxe.pdfIn PDF document text
    • http://saaretravel.ee/images/file/18032569427.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-22/20210922152124921586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=watch+harry+potter+chamber+of+secrets+123PDF 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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 18060 bytes
SHA-256: 0429a5a70af0566f1fa018fdfe99f813a0e7b05c52e7870f12baa76e6bec1145
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 11092 bytes
SHA-256: e6bba99e2b1d3ab8c6b7add2aa1a579e319c3d46575c63d760d31eb89b8f30bf
font_02_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.