Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61461c08b218182…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 09:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9205fc4726fb1903f0e0cec9ef2e4ae0 SHA-1: 551fb79d042870a901d410c3a2cb2e74e8b2bc64 SHA-256: f61461c08b2181823c953489bf0c47c5add1567da048f383067a79effaa6882f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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 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://savitravel.ro/ckfinder/userfiles/files/25249526697.pdf In PDF document text
    • https://sadhankendra.org/erc/media/11978378835.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/31854043207.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t21kj8cg877k7cvf1qsmhr47bd/katefuta.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/71511398338.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/38023199660.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/95550393020.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/96916563516.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109071033403624.pdfIn PDF document text
    • http://savemaxint.com/files/file/91213867349.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161411118f310f---23951994208.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/xewowakawuvujerokapu.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/48291701309.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vofinifujitar.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/lomajezumaludes.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/68687929262.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/rexosizokanafomamisakana.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/namazunenizusipixa.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109040425352972.pdfIn PDF document text
    • https://tipresentoio.it/images/file/92199348393.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/potumavadabovetawuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+11+honor+20PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 18212 bytes
SHA-256: a88b8a0800e974935bea4a5a2484379feb95eb89971f55f607e148b36c95061d
font_01_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 10016 bytes
SHA-256: a3ffec1402cfb88711fddf754a3ac91e97b4f90890a01c1afd12cc624ccc67dc
font_02_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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