Malicious PDF — malware analysis report

Static analysis result for SHA-256 488c349e1b4e083c…

MALICIOUS

PDF

66.4 KB Created: 2021-09-21 01:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3e68249e897affe96eca5311205bff6 SHA-1: 1e95061eef59e9aa168312ae7f04cd1a784fcc9f SHA-256: 488c349e1b4e083c6d4b6131474b1d1f6d02a0611ca75c5d527110d117c2c5fa
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, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wupaojichangjia.com/d/files/78539578658.pdf In PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210912_9C836FC491BBE9E8.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/5419301127.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/40299125605.pdfIn PDF document text
    • https://value.ae/userfiles/file/nuxewolitatol.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/51256413423.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/vodadu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/gekaluzamitoru.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/21854560205.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/17479697958.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/80313231338.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/30302353221.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dopexitok.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fe1bc01b4e0aa6bd0dd4fdb2df6072e0/24136937952.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/33926351315.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/funorezakowixogamor.pdfIn PDF document text
    • http://dalaichau.com/files/24099084983.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/61268575053.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/egqvdee54vplf2rbolg40e8j61/1120664521.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/58799743078.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/lamip.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/18946803731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=d%26d+spell+sheet+pdfPDF 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_off0000ad16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 14704 bytes
SHA-256: 9d855a647e342ced2f2ddb63d239f35608623cbae7fa1031305c79dc1dea1f4d

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