Malicious PDF — malware analysis report

Static analysis result for SHA-256 3546d8dba55079b9…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 07:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 590e7d4167886cac4175e0ff7589a5d1 SHA-1: d5926b89e5e9dc942b188695979d2e9432cc74ed SHA-256: 3546d8dba55079b9c1da4c37e501a08d09a558dd1cdb191e163b2489c0e4ca38
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to game matchmaking. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish credentials or deliver a secondary payload via the redirector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+does+r6+matchmaking+work In PDF document text
    • https://cdn.sqhk.co/puvegipuros/eFja8hd/77767004608.pdfIn PDF document text
    • http://tudovawo.22web.org/aromatic_heterocyclic_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/jjggcgi/29904945198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_601ca5bd26d0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368468/normal_5fceb1ffa0531.pdfIn PDF document text
    • http://pupijepu.22web.org/nisuresowilokejaxasokemip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fea052361046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5fd8fb21314ff.pdfIn PDF document text
    • http://puralivivupose.iblogger.org/android_emulator_apk_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kusegipe.epizy.com/zojisazenijitogi.pdfIn PDF document text
    • http://varezekavon.rf.gd/how_long_do_rinnai_tankless_water_heaters_last.pdfIn PDF document text
    • http://rezumasalimod.epizy.com/credit_report_dispute_form.pdfIn PDF document text
    • http://tiwogiponifi.rf.gd/lafepifidosutol.pdfIn PDF document text
    • http://gebibem.epizy.com/bofezuxo.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 5592 bytes
SHA-256: d424d8598b8391ee24c6022453f3284502a95f0a98b10b2fa2a8e9b4b7418489
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 9772 bytes
SHA-256: bf122e75622e2bd6d25245b65c598d24595f4674bbdcd9611bac0eb3cefb5e93

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