Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dc0952ac7af3e0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 20:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 591bfe6b5895cdf93b87cf11f9839f8d SHA-1: 7b861ecc36e09bdef24fab14eee55dbf1c814365 SHA-256: a0dc0952ac7af3e087f555d79d6f6eff4133c8ce090130a581d597fd8c564445
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 for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish for information. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=robbery+bob+mod+apk+2 PDF link annotation
    • http://mrspk.com/ckfinder/userfiles/files/jubodidarudomodelesoraju.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/benowuwaz.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sadimebodojesalatoxoxo.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/42834260529.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/mevefisol.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/28707902267.pdfIn PDF document text
    • http://kustari.net/userfiles/file/jinip.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/gavufipikadomebegutajoz.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/ninujokusoz.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/568639017.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/93938996591.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/gasivofigomowutoniletutu.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xumalofumilax.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/48791289868.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/61418696327.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/bozewumitalazemijowi.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/52118022685.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/86510803657.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/88226664989.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/xelekudifepusep.pdfIn PDF document text
    • https://greenways.at/userfiles/file/fewemovisonirolakozuku.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/86746255828.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_off0000b25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 10556 bytes
SHA-256: 9900c031b251edf3c1877b3f1b071ff8c1d06a536d52d94d3ff0ee2b695380f1
font_02_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 17076 bytes
SHA-256: 5132f4196185134443b7432699ea6e5e6ea777e764425a73ad90d55ddfe33927

Open this report in the interactive analyzer, or submit your own file for analysis.