Malicious PDF — malware analysis report

Static analysis result for SHA-256 463343d6b9186aa1…

MALICIOUS

PDF

75.5 KB Created: 2021-04-17 09:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4c55ac129429c1a3d631f35cdbb608eb SHA-1: 9fcf9365333531042c34b0ee964d95a5c29b43cb SHA-256: 463343d6b9186aa12e0a7b6b303680e40a708714febb4a224a89f6d638e7d648
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference celebrity net worth, a common lure for phishing or ad-fraud schemes. 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-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://midufefew.ru/strik?utm_term=how+much+is+naya+rivera+worth PDF link annotation
    • https://varupeneg.weebly.com/uploads/1/3/0/9/130969993/xategopuxesofiz-fobag-texuv.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/dozigitipajufamo.pdfIn PDF document text
    • https://xubedemowixur.weebly.com/uploads/1/3/6/0/136004279/6254147.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/hjjjwhc/46151309643.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/bBJihhb/91743241596.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/Lulsdjj/combi_malayalam_word_meaning.pdfIn PDF document text
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/2453610.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/7d7dbaa4b53b.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/Oxijjhy/word_trip_luxembourg_puberty.pdfIn PDF document text
    • https://xanipopig.weebly.com/uploads/1/3/5/3/135345317/8445909.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/mghMaig/get_lucky_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/d3qqji5/kidikaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6e7f4f-af0d-4751-90fc-7580669becd8/communion_whitley_strieber_book.pdfIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_6c9a713cf370493ea99e4ae32a82c2ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da6cd819-9d07-4c18-89bb-94ddfca0fb98/93673244966.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_4939b352f644480286374360da3995c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8093683c-de59-441e-a35e-81058f986cc9/56077876797.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_33044c5b1a3f43bdb54fe49c7853a096.pdf?index=trueIn 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_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 5220 bytes
SHA-256: 520fb8e21542ef3efa41b0a81ea6fb55f86e953a2f8283c013cb6056a02784d1
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 11144 bytes
SHA-256: 121554136a65e66e172778fc1c3452806ba5dcc0b445cf2b60bdcd27eff24c55