Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa40ffd06795350…

MALICIOUS

PDF

96.2 KB Created: 2021-02-27 18:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e602c90d6b2427295580222f09a4bdf7 SHA-1: a55ca7c59bdcb606a31cf3353183057fddf701be SHA-256: 5aa40ffd0679535030d6ac590a1100da9702e2d40572168082b9b631aa2b78df
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, indicating a link farm or SEO manipulation tactic. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to drive traffic to potentially malicious or ad-heavy content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/strik?utm_term=why+did+islam+spread+so+quickly+dbq PDF link annotation
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/2ab63af904f.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/gdktggc/16066064095.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/hiig3qC/zenafarupewixebalomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_60038e415a300.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/bCIjpid/41641164560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5ff286c2a227c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fecc8385e81f.pdfIn PDF document text
    • http://wenamifub.22web.org/32872133433.pdfIn PDF document text
    • http://nisisigewu.iblogger.org/ordem_characiformes.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/ft7fgdM/national_geographic_magazine_resale_value.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/Ljf3wge/17430544895.pdfIn PDF document text
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/rupexetuvarevoso.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/eF5rgi3/doordash_login_error_code_400.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/3awWZc0/pirakawusoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff764f1e4c92.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/ejidiaL/75504874422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naremijex.epizy.com/majuxobonizurexewofezen.pdfIn PDF document text
    • http://zexizel.epizy.com/kivosufapimasevubur.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00012477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12477 5756 bytes
SHA-256: 136cd19f323779919c493fcd57aa9eb145b366bbed67e7ff57b564bb2bdf2e98
font_01_sfnt_off000137f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F0 11400 bytes
SHA-256: 8cbd13f286fb0e6c82812d106fcb11280b1fb239a8eee5459d9ed8556aacc1c0
font_02_sfnt_off00015dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDA 16148 bytes
SHA-256: 3be2d22761a10ac2f6cbc188a7790643c99530e619a3c5146d325b2ec12fc92c

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