Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff1c380bf57d5d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 07:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0479a9ee25fec7f6704a1b21f116b0e4 SHA-1: 43be5afa58e6b76c724a759ea8843acc76101211 SHA-256: ddff1c380bf57d5da40dc34714c6294553965b2c2028e2d5a916d019b58fb098
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The document body is heavily obfuscated, but the presence of multiple PDF_URI heuristics suggests the primary function is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=allen+heath+qu+32+service+manual PDF link annotation
    • http://centralcogtc.com/uploads/file/zixawonusemovokimev.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/28591273982.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/69810573326.pdfIn PDF document text
    • http://teraval.cz/res/file/26938462530.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/sogerara.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/83280272682.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/68123324662.pdfIn PDF document text
    • http://funperm.ru/content/file/71128608154.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/15398264276.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/55817685082.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/45870131097.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/92182022017.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/ganutapisolesime.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/31746433115.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/vopopafela.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/261079d4ee3535aa2e86f8e6d8330a85/2955118363.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/55962979643.pdfIn PDF document text
    • https://campermagazine.tv/public/file/sawoguzotivuweme.pdfIn PDF document text
    • https://actor-conseil.com/files/file/robexasitefure.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1e2258a25---27117692676.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xizesudevawonisijemomemis.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/5947589648.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://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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 18568 bytes
SHA-256: a6df1a09d2ecd8863834cc56a04d1428d18da3bd5f04f8759fedd128150823eb
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 10960 bytes
SHA-256: 43c3bd99d33a8ed3eb1da917218614b71d40f826f9b69d8ae5ea0a1b2dd0874b
font_02_sfnt_off00013b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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