Malicious PDF — malware analysis report

Static analysis result for SHA-256 4559086edaba5aab…

MALICIOUS

PDF

72.1 KB Created: 2021-03-09 06:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3671bef84b672541d1625fe4b6d6e50b SHA-1: 9c0ee35d387a237c23c29c3d23fef3277e425ae9 SHA-256: 4559086edaba5aaba7f9bf179f2fb76e88214cfd82ec7f8e3f5dcc3ec5f465f2
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be related to search queries, further supporting the lure-based attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

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://gimoguvi.ru/strik?utm_term=what+is+the+size+of+an+ipad+5th+generation+case PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475741/normal_5fd18c45a8544.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/0185cf299fa1.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/luzogugabujur.pdfIn PDF document text
    • http://fuviguz.22web.org/8804663837.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/xixebewebiketopex.pdfIn PDF document text
    • https://metojonokodoto.weebly.com/uploads/1/3/4/8/134881876/1262205.pdfIn PDF document text
    • https://tekaxudifen.weebly.com/uploads/1/3/5/9/135992886/bunanini_gujimefogesoka_sojenajibijimos_migop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_600bb7416bc09.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/xudoboz-pamefegoditudox-vodesizupon-tokutosod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481540/normal_5fcf133bd0674.pdfIn PDF document text
    • http://pojekofa.iblogger.org/54120959501.pdfIn PDF document text
    • https://lononefebodamu.weebly.com/uploads/1/3/2/6/132696526/zotek.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/novofekulutov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pubopelej/94512221868.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/clarence_larkin_revelation.pdfIn PDF document text
    • http://tepokubomime.rf.gd/lake_guntersville_crappie_fishing_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/can_i_use_toothpaste_with_my_waterpik_sonic_fusion.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_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 5572 bytes
SHA-256: 19b17888cee2959f78ce3de71a37feaf4c530ae18d7eb92db1af8b9198f1d553
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 11060 bytes
SHA-256: dbe8fa8dd95e7ca5c79f0a56c492a811a680be394508df645b8dd781a3ecd8cd

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