Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7a2755ffa988cf…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 00:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de949702f2f688c8beeb4b89fa404f31 SHA-1: f3c12b2dbc8cc90e36893fc018f0739a93af62bc SHA-256: fd7a2755ffa988cf9d667146423d7a6d164f7018158a58ceae405d0b42aaa7a8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF functions as a link farm, containing numerous embedded URLs pointing to external sites, with a high density of links on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to lure users to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://taybaite.com/userfiles/file/9282884411.pdf In PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/31179549466.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/wiwidomamepafitu.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/meminoramuxav.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/91056097097.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315da2c5cdf---79806912642.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/ropuzunutonajunavubu.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/raraxe.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/roxekimejeze.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fudopexusuv.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/61379638010.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vunalopamewu.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kezedewi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401920b4fc1---tutajokekevipitubofusaw.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/62820046240.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/47071116687.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/41600006069.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/zudiruti.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/76230274650.pdfIn PDF document text
    • http://www.moyekolodin.com/files/vururaxoso.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/jabopizekemaxefalemiguli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=homegoing+book+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/10729457696.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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 17800 bytes
SHA-256: 214c420f6957a6eaf07bd1aa4bf8a3f92ec82e22f6327c9c87f55df8fdfcfd4b
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 10492 bytes
SHA-256: 7f703f6492f0b97d08cda83f5b81a5a4ba581b051f329ef4a3be3eb8c5c5e597

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