Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddffb1ef2263ec4…

MALICIOUS

PDF

72.8 KB Created: 2021-06-10 02:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 32b0b0b2954308d6caa2a30913170bc4 SHA-1: 333e6378640818e53de73932640152b0b29bed4f SHA-256: 4ddffb1ef2263ec472bf8acbb6e1df20ef6c944ff9961010b3c3a2744c8fd306
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, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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://coretry.ru/pbw?utm_term=pokemon+free+ds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381539/normal_602ab74177337.pdfIn PDF document text
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/16d14c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_6067f6c0b6c5e.pdfIn PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/3917934.pdfIn PDF document text
    • https://zogoxakemu.weebly.com/uploads/1/3/4/2/134235374/7957863.pdfIn PDF document text
    • https://tuvajidemagik.weebly.com/uploads/1/3/2/6/132681445/ruvijezid.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/3109056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382003/normal_5fc6b9b4a6347.pdfIn PDF document text
    • https://tonusawojojumo.weebly.com/uploads/1/3/1/3/131384735/1861897.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374522/normal_60b4db064fe5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_606a7a57c2dfa.pdfIn PDF document text
    • https://regenapewafixun.weebly.com/uploads/1/3/4/3/134364718/317135.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/7060420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_601af8f20ca70.pdfIn PDF document text
    • https://kobuzefejara.weebly.com/uploads/1/3/1/4/131437799/niralebujepe_kovututemikado_doluvi_fexebili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_60184896ab97f.pdfIn PDF document text
    • https://xaloxegapix.weebly.com/uploads/1/3/4/8/134862860/fuvafapono-lebajojog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144707226/ruh_sal_ve_hastalklar_hemirelii.pdfIn PDF document text
    • http://filijego.pbworks.com/f/56911750732.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/plants_vs_zombies_garden_warfare_pc_download_size.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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 4876 bytes
SHA-256: e8dbfb47a47556ca7e7789f45f0ed506de9a5b573ed357b3548e2b7b3e3f1313
font_01_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 12864 bytes
SHA-256: 8b3d4bd0ad02775e12b558761bb18c34b8e87cd2d0149097011d9cc0f774ebda

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