Malicious PDF — malware analysis report

Static analysis result for SHA-256 53175af0b1fb30d5…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 19:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25be1fd56ea291aaaa81f41c9e220dd1 SHA-1: cd05d50d814c1d1d151a53969ce4e88d08c0da0e SHA-256: 53175af0b1fb30d5155bf1e5a5306d61eef48518d8d179c8e2a85d3357082a6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://aucoindeshalles.fr/menu/file/70930964100.pdf In PDF document text
    • https://galaxytraining.examinationonline.com/files/28087921175.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210915152545512234.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/85225627294.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/45437718866.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/80373992521.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/96057393675.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/99321924053.pdfIn PDF document text
    • https://anup.bo/images/files/kazirewexevusixerevesaguf.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/xupiwitewod.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/19215571691.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/tibikadudobewemivosojar.pdfIn PDF document text
    • https://botroul.be/uploads/tegovovet.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/24649984308.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/xekedajebofeke.pdfIn PDF document text
    • http://silver1979.com/upload/file/taxinikemarokisonugap.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/92122271253.pdfIn PDF document text
    • https://costarica4d.com/contents/files/jaxexutodapexatav.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/xoveferizasewupote.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/fawamagapelixitedutenone.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/84975468582.pdfIn PDF document text
    • https://bor-diing.com/upload/files/tezologidusimetufuji.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/92151665863.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sisaxazozaw.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2b7d77ee---8221861970.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/50327622295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=grey%27s+anatomy+season+7+123moviesPDF 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_off0000c160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC160 10868 bytes
SHA-256: deb592457ec7f303eae4978b16b4fe55c91eb11ad3d00cb1c0a53236d5bbd1d6
font_01_sfnt_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 16820 bytes
SHA-256: 8d83528b6d257ac9d598cd235935839e5ad097e6b8f8ad00b4fc9ac34289a71f