Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fb0d524512855f…

MALICIOUS

PDF

110.6 KB Created: 2021-09-16 00:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cb6c768b2e16bc6f4b481f2e1334e785 SHA-1: a8049ed8c4e349d19e2f82aa84983b36f4592430 SHA-256: 64fb0d524512855faf94689d50e744080363cce5f04040f868d14e52745f36f3
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and the presence of external URIs indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://chinahk-ip.com/chinahk_ip/html/files/editor/file/dakujivovosodipun.pdf In PDF document text
    • http://sipzip.com/userfiles/file/93319485294.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/63149900567.pdfIn PDF document text
    • http://cloverdiamond.com/file/sowaresuwa.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/wazalibojijozewu.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/73859365872.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/55636290913.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/63199258004.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/1773848797.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/21642687265.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/91384339472.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/10527613984.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/bufejubepojuxunu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631267382.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jeteruxijugepavisuwawiv.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/87051503731.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/meduvedaragasapexiwuda.pdfIn PDF document text
    • http://anpharma.net/upload/files/69336756391.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/71809382416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spin+and+win+iphone+12+pro+maxPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E7 20556 bytes
SHA-256: d7c24d7461c5ab8f6285a8a07538c45621127322d25fb220a2f7aff22240448a
font_02_sfnt_off00018ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC3 10780 bytes
SHA-256: 7ad87d29dbab4a5f74d0e4255e0252a5490f62be5e70538f56e3154ab0ac1dcf
font_03_sfnt_off0001a376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A376 1824 bytes
SHA-256: 9637eb3b65087fa5a8fa3d42dc2ca013b5bfc9796839d72b03baf48b38047424

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