Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55ac4bed5cb8ff0…

MALICIOUS

PDF

73.0 KB Created: 2021-03-07 01:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 823079c680afe633dd45dfd20cd3897f SHA-1: 90b8a6f4696862ffe3a50ff3eaf358acc2676371 SHA-256: d55ac4bed5cb8ff0bc42862430f8045be04803c3ec3d2a160e1716f8b564d9da
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=delete+badoo+account+facebook
    • http://all-host.site/29655827987tbrfh.pdf
    • http://zoguponuwuxoli.medianewsonline.com/42388680564.pdf
    • http://viniveba.mywebcommunity.org/can_i_track_certified_mail_without_the_tracking_number.pdf
    • http://coolvdomaion.online/605803755918gsft.pdf
    • http://magic-world.site/how_to_read_balance_sheet_for_dummiesqk6rt.pdf
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/4713149.pdf
    • http://bidizujimon.getenjoyment.net/mp3_murottal_30_juz_free_download.pdf
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/xugutizudusuva.pdf
    • https://zomusabizexeko.weebly.com/uploads/1/3/4/3/134317177/ff5c501133f1fc.pdf
    • http://life50it.pro/john_maxwell_21_irrefutable_laws_of_leadership_quoteshzxm7.pdf
    • http://canlisohbetim.net/the_secret_river_andrew_bovell_quotes2our5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mojogoralil.onlinewebshop.net/73443879987.pdf
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_d32cbcc38abf4bfcaa53d4ea42da28e4.pdf?index=true
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_1205619ad4e240cdb9e5bb50254de754.pdf?index=true
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_b872e47aae254d4a8a424dd30b8f36ed.pdf?index=true
    • https://s3.amazonaws.com/xuzed/57711391953.pdf
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_4658403b9da24db19e1bb5a5cf9686ec.pdf?index=true
    • https://s3.amazonaws.com/xamapebonijos/tezozexomumudivabute.pdf
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_6b5cdcd440964ac19d3dde5804a1dfe1.pdf?index=true
    • 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_off0000e2a4.bin
1f91f10db8eac51f8906f936ab4ab238f81e2c6eb83b7f4b07d03b2aa0d6f1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 4944 bytes
font_01_sfnt_off0000f38e.bin
7cadb10392179ad95a04ea1dbd2883bfc44b8c87906a218a5962d6583054a3aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 10392 bytes

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