Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec52e129c6d25c7…

MALICIOUS

PDF

87.0 KB Created: 2021-03-02 22:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7c0c77b67cffae4b3df8a339b68c06b3 SHA-1: 59b1f25c307aa4c91a244a2ded012c505f61d6d4 SHA-256: 8ec52e129c6d25c7410fe2d1169afb5969d1c2a11e6f627f9360e8273cca1d4e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/strik?utm_term=adobe+indesign+photobook+templates+free PDF link annotation
    • https://cdn.sqhk.co/dusaradezat/Pgi2nRz/virewubusajepuzuboz.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/6773964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484376/normal_6021e7c106f14.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/gowiraselulako.pdfIn PDF document text
    • https://kufidadifijerid.weebly.com/uploads/1/3/1/4/131407945/3ed0272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_6021d3714bbf9.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/Pivighg/xixub.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/bhiihdS/live_stream_tv_app.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/hhaDCZm/kelagipesuwojiguzidu.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/dighh5N/59410774550.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_6008603d6e055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nubirenewukuz.rf.gd/58903616519.pdfIn PDF document text
    • http://garubokiboja.rf.gd/handmade_baby_shower_invitations_templates.pdfIn PDF document text
    • http://xesidif.epizy.com/96834220509.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/request_for_british_passport_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/93911189210.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/rufuto.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/quiet_love_charles_aznavour_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/dagedamipugew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 5436 bytes
SHA-256: 4ec5099d46c5517d5ae1ad117778e4f1de4244d709b4023af5a8b7aafa2284e1
font_01_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 10732 bytes
SHA-256: 31084d5d05f3e2e4b00371f1701fbc498fa62f177697c815830383567c6796ac
font_02_sfnt_off00013e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E40 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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