Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b57642393bf81e0…

MALICIOUS

PDF

70.9 KB Created: 2021-02-21 21:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace3e4c6b80526f0ce71221694500e8e SHA-1: 7de5817d11dfb7e21b844f5c7df51468a98e0663 SHA-256: 9b57642393bf81e0d45362064b16ce96b85f181f14115a0963959aa87e031228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for link farms or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/123?utm_term=ecological+succession+worksheet+key
    • https://fotovotujipibar.weebly.com/uploads/1/3/4/2/134267097/xinal.pdf
    • http://vk-settings-change.online/awm_pubg_soundhoblt.pdf
    • https://cdn.sqhk.co/kukelagalefe/ROhdMja/wixusepatuwapawa.pdf
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/994f842e78e5a.pdf
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/xajaludin.pdf
    • http://mosaniz.22web.org/centrosema_macrocarpum.pdf
    • https://cdn.sqhk.co/xipovowimugo/RifWuha/difiwitelinaliri.pdf
    • http://itverys.space/97566736890855gy.pdf
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/fawub-kuxavotifi.pdf
    • http://chelamela.org/nosofoxorovezevezasavadfa27i.pdf
    • https://cdn.sqhk.co/gesokusa/iGJjdjS/mikefepo.pdf
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/6263273.pdf
    • https://cdn.sqhk.co/tamikoveken/Uhhjegf/beli_pulsa_lewat_m_banking_bca_gagal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedojigudaj/47192934608.pdf
    • http://semazixiguf.rf.gd/pillars_of_eternity_gamebanshee_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d775.bin
d8e02ed7a258f71ba2a118dd85ca38a4fb40bea2e7cfd5d37e258a8b68444efb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 5276 bytes
font_01_sfnt_off0000e97f.bin
5f0ebae0a38043bf0dff68e7724a8527c94bfec0b1c96628da2e2484e2be3309
pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 11492 bytes