Malicious PDF — malware analysis report

Static analysis result for SHA-256 23df866e65f01e08…

MALICIOUS

PDF

79.6 KB Created: 2021-04-20 06:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fa73b7f9e4d349976957e32823ffa4f SHA-1: a9a1854ab88b7dcbd6e2f8fb558c59e66b1ff33b SHA-256: 23df866e65f01e0830f96a0421e3b407af83e80cc508ed6b7fb9298c4f1b283e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The document body, though heavily obfuscated, contains text related to a 'realistic portrait drawing tutorial', which serves as a lure to entice users to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=realistic+portrait+drawing+tutorial
    • https://cdn.sqhk.co/jisokemefaz/JVijgii/rolling_sky_all_levels_unlocked.pdf
    • https://cdn.sqhk.co/nobipajami/sjcwgcs/vanerawekoguduz.pdf
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/relajix_viwasi.pdf
    • http://tobalalupuvobiv.iblogger.org/bofenudo.pdf
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/dubaniwu_talameso_javobadutalog_feboz.pdf
    • https://cdn.sqhk.co/gokarunedod/jhhcxgi/97367315894.pdf
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/xenin.pdf
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/pubalosikeg_nebesuxuvi.pdf
    • https://cdn.sqhk.co/xubupigegi/9ijjcIS/color_picker_tool_download_mac.pdf
    • https://mutikotamibe.weebly.com/uploads/1/3/0/8/130874320/fepuwowafuse-zivovuroped.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_4fc0e4526343436c9af8add523ed8a33.pdf?index=true
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_8b9229222a824533bce5d64bb82960d3.pdf?index=true
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_e78a9ea400704378a5181d38a2c73151.pdf?index=true
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_5acc07a794e343cfae2a0e5c47ac45ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/870eccfa-7cab-4dc2-8078-031493229e2b/76220485598.pdf
    • https://uploads.strikinglycdn.com/files/9b2c8378-47da-4614-b20c-8badd1a1123b/7621858973.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_85e22011e7f642faa4170904f249b933.pdf?index=true
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_56f7b2abeda14092b3081cddd1d84deb.pdf?index=true
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_35250500f3c0438a8ada196e5f9777aa.pdf?index=true
    • http://rujunigowe.epizy.com/zabujijonivoworejuk.pdf
    • http://rutenodisekorin.rf.gd/8d_problem_solving_form.pdf
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_3b9b5d9c3e154a369f6754fa3723387c.pdf?index=true
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_4b424497cb1b4e30a0855ee4d6108bfc.pdf?index=true
    • 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_off0000fa95.bin
bbb669f5915563b9eebfd8a43f9505ced3c7051018d454f1133e1bf7dcd7acc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 5340 bytes
font_01_sfnt_off00010cea.bin
92282cff00623c14880011a94d513261f8035cc0bfe3f4788ade5f84044c8ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 10416 bytes

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