Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48d3a129fbdb3d6…

MALICIOUS

PDF

74.3 KB Created: 2021-01-05 02:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: aa5827377b40a8097c7e1d59439390ba SHA-1: bf815dc9d6371b2eb63ad9ab4d201908e605382d SHA-256: a48d3a129fbdb3d6117e7b8d6d9bb57fcd33352fb0abe9efe2884a9077b5a76f
192 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The file contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate malicious intent.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=north+harris+college+writing+center In PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/degewuru_vevevaguwetu_rowux.pdfIn PDF document text
    • https://wojatobarub.weebly.com/uploads/1/3/4/6/134612389/totiwegupane_rotefaje_senokenobuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5fc2df0315c1f.pdfIn PDF document text
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/50ab44.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/xubomug_digoxoxuj_wijupulewawur.pdfIn PDF document text
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/6544237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_5fc2caca585a8.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
    • https://uploads.strikinglycdn.com/files/fdafcc6c-e41e-43ce-b86e-02ecc023d691/91986682005.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/carpathian_forest_discography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7780d4-8d09-454a-839f-3d0dfab7b35f/92093328793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb82d77-46f4-473f-b986-fc74ad50ad6f/5e_xanathar_s_guide_to_everything_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9f2a40-2800-460a-9dfd-2307d93673e1/rupofalin.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 4912 bytes
SHA-256: 48a7a4903a5130a6db6d64df02d7f87ada47943cfbb6b634f2ae22a90524a8c4
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 10868 bytes
SHA-256: ae557f242fb8471a7c18e36be5fdd24bcc5ae33cf9090791634343362afdc38b
font_02_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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