Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4057a3505758dd…

MALICIOUS

PDF

73.3 KB Created: 2021-06-09 20:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f03cd45e1c5b7a941c395172e7b673a SHA-1: 8084fcb823de2b09ee8d6c177ac2a746a309b08c SHA-256: de4057a3505758dde06412f3ee70155a5d295e25690942a08fd8025d2343d67a
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or SEO spam campaign. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The primary external URI, https://inwebjor.ru/pbw, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/pbw?utm_term=swami+ayyappan+pics
    • https://livabawixegi.weebly.com/uploads/1/3/4/3/134320323/navezupufegot-nuvalowevafoxe.pdf
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5fc941493165e.pdf
    • https://xewezepi.weebly.com/uploads/1/3/0/8/130813550/e5bdafa1e8.pdf
    • https://boxenujevodaziw.weebly.com/uploads/1/3/1/0/131070305/84fe5c6dcf8a67.pdf
    • https://tekoxinir.weebly.com/uploads/1/3/4/6/134606092/5e598896.pdf
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/2115458.pdf
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/9877107.pdf
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/2216363.pdf
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/disubonarasudinuneku.pdf
    • https://bubijusafas.weebly.com/uploads/1/3/5/9/135994311/gedulimemobiw_jezujup_vakupor_tuzugul.pdf
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5ffdc120c84dd.pdf
    • https://padikolejak.weebly.com/uploads/1/3/4/0/134042397/6b88880df06a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4c2236e1-960f-42ea-9b69-54a517e3371c/ludamude.pdf
    • http://sawebaz.pbworks.com/w/file/fetch/144763695/how_can_i_reduce_file_size_online.pdf
    • https://uploads.strikinglycdn.com/files/52b6235b-f33f-402e-aa3c-61c84ed6c329/gejuxidowileka.pdf
    • https://uploads.strikinglycdn.com/files/fb7ac2d2-9b00-44b2-8b9e-db7653fd1b95/xewol.pdf
    • http://lewiwebula.pbworks.com/f/90510678200.pdf
    • https://uploads.strikinglycdn.com/files/2b4ebd3a-a6e8-48a5-a601-a7ea511a2743/38941664456.pdf
    • https://uploads.strikinglycdn.com/files/7a72ca75-b904-41b9-8787-64f048a0738d/xemomipar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa9.bin
c037972ac0ab002afc1a9ebb03a671d880ee6f48731dc5af108ebbd75246bcca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 5248 bytes
font_01_sfnt_off0000f18d.bin
d4fb2d20a69906476ed9d626ca43bed8fcaa485584dd4b92389bae42bf87a225		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 11052 bytes

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