Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7533a7788e88d0a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 13:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c04eae13b307a138f59b83f7613cce8d SHA-1: b981bca5e08b0f8bbebb28228ae565b6775d4c42 SHA-256: a7533a7788e88d0ac6640a01a40edbb800b0176cff1d670009d6598057fd3b6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it directs users to potentially harmful websites. The PDF structure and embedded links are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=material+design+react PDF link annotation
    • http://avtokapriz42.ru/userfiles/file/32037286337.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/dekuv.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/1065501675.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/12671753008.pdfIn PDF document text
    • http://meditopthailand.com/file/80640757317.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/41255347889.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/gasodipil.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/46845232060.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/78728383326.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/3011369486.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/fovemovelomugivarus.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/538ffc1ca7bbc8cf989aa8d954877033/80385113527.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8988667722.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324c4367006---87316526702.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/nobevarurebologirerik.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/bamadufe.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/tuvisemosawamutilani.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/79292848649.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/98763314654.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/79727619714.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/wagowevuwobesusulu.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/92498315355.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/38682119359.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/walubabejazesezirap.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/44322109417.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/rafix.pdfIn PDF document text
    • http://isvpro.com/custom/files/67194788754.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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 10420 bytes
SHA-256: b235ebe0072ba695378bc0116f87fce9b913e0135ca05a1778b212af1b7ff2e7
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 19772 bytes
SHA-256: c7e04860e6918ccdf67f39c488f4fb63b9b09c32df3665f50e3f246d619768c0
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1