Malicious PDF — malware analysis report

Static analysis result for SHA-256 7505541665f0139e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-21 01:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 404441ca48031890a3f1dbbae9e0eaba SHA-1: 85b595c185465c631735c8bd7e8aa944a5191703 SHA-256: 7505541665f0139e1360863a59b1e00f597d756a5030ff0ee2beb086b98652cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many with UTM parameters, suggests a phishing or link-farming operation. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crysiq.ru/uplcv?utm_term=pencil+photo+sketch+apk PDF link annotation
    • https://ags-car.com/upload/files/zizogawonuv.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/pimusixizofuxo.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/wefigirero.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wupojemeni.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/34639482528.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/64503565531.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789fa049f---47256030895.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/36210593463.pdfIn PDF document text
    • http://zenithmetals.com/files/xopugafewazexitomi.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/waferukulofezu.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/zoketipulejagujexo.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/56599436651.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/90491004757.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/xorulu.pdfIn PDF document text
    • https://akemi.ro/hirek/file/binivi.pdfIn PDF document text
    • https://tcremich.lu/files/files/buvelu.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/54130563952.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/binojoxu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/lomoxamusibox.pdfIn PDF document text
    • https://filetorme.com/upload/files/fakelex.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/17445373298.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/78683727117.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/57463481014.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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16624 bytes
SHA-256: 2d93dcd4c86cc9d182ed3b9d58f3067d551819894cb3594bb5e08da51ebe3e5d
font_01_sfnt_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10464 bytes
SHA-256: 4f931d56068418039b902a5b663957040fd8999848d8401a3aaef5c6b9703acf