Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e51e138afbdb880…

MALICIOUS

PDF

74.2 KB Created: 2021-06-05 14:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7252f54237b6c288b9fdc3a2ad7db3b1 SHA-1: da1fd1adf8534125e7720f05ec2d0d40a7524ab5 SHA-256: 8e51e138afbdb8808c79104d56b10ef76c330cb5e5a1d667b331afa3a5e3443e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, with one prominent URL pointing to 'infrive.ru', suggesting a potential phishing lure related to a medical condition. The document's structure and the presence of many links on disposable hosting further support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://infrive.ru/pbw?utm_term=insuficiencia+renal+cronica+terminal+que+es PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375504/normal_603be0b133775.pdfIn PDF document text
    • https://nigipesifagezeb.weebly.com/uploads/1/3/1/4/131411762/8318374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_60018d4329b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_5fd9c98428756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5ffa7f2d59416.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482020/normal_60aff668bef9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5fd133b2de9b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449605/normal_5fe186de40e92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fcb1cfae7411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6030234e01f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_606d40b3aed8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5ff031888944f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4498678/normal_60b218f7af31e.pdfIn PDF document text
    • https://zunoratev.weebly.com/uploads/1/3/5/3/135345657/7618013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojekepodef.pbworks.com/w/file/fetch/144633990/bowadovodir.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/how_to_install_safety_1st_grow_and_go_car_seat_front_facing.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144486306/xoxesufupafewivepatimotom.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144425175/tanujivupelitovimadop.pdfIn PDF document text
    • http://mejigulo.pbworks.com/f/40603884010.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/telujuwetip.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144446760/is_bingo_blitz_free.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/dr_collins_pcat_study_guide.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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 5092 bytes
SHA-256: 5df5feb4fd71ba42789cdd120da949c055f5994460535a893d601f9ff6ff736a
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 11380 bytes
SHA-256: a2b333e63b4fad5786ffbc13fa85f8f1f1614464336fc294e97a3c378bfeeb50

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