Malicious PDF — malware analysis report

Static analysis result for SHA-256 339a9af4cde03b19…

MALICIOUS

PDF

81.0 KB Created: 2021-02-17 01:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b788dd47b17c11bbdfd1ab891ab17ff1 SHA-1: ba8001d8dd363e8fb2a1f88b4e14cf7284101006 SHA-256: 339a9af4cde03b1912729a1b8e8a5bfd5be9d7be5ce186a37a97fb12afe21a38
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains text related to software tutorials, likely serving as a lure. The presence of external URIs, particularly the one pointing to 'jacksth.ru', suggests a phishing or redirection attempt to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+learn+ms+access+2007+step+by+step+pdf PDF link annotation
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/4845258.pdfIn PDF document text
    • http://vafakewa.iblogger.org/cd_siz_format_atma_windows_8.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/pivajifewuxumaxu.pdfIn PDF document text
    • http://ukrinsure.com/83146075856hxn65.pdfIn PDF document text
    • http://aires.fun/junajogijiwotiganametekf9tdt.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/5845038.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/kafukiva.pdfIn PDF document text
    • http://hiziryigit.online/dokotin2808.pdfIn PDF document text
    • http://varistop.site/canavalia_ensiformis_para_consumo_humanoflk2x.pdfIn PDF document text
    • http://pufonorigaji.22web.org/buxozagurirotinurag.pdfIn PDF document text
    • http://f1l3download.site/58555602232ftu60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lalexipitu.rf.gd/uc_browser_for_android_2.pdfIn PDF document text
    • http://fazafof.rf.gd/ruxoziketef.pdfIn PDF document text
    • http://famosubapaji.epizy.com/accounts_payable_audit_reports.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 5948 bytes
SHA-256: 396b1b2a3f77d7ffd18b1818081f726809568eb4feb16936b11887810b61d7a2
font_01_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 10540 bytes
SHA-256: 914dc207f71b7fd23efa15c051aaa52b6347158100aad928355aedbc4eb0ac02

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