Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cae1f6a37fa89b4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 03:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9663129eca42d9bae1790ebd04dfd34 SHA-1: d532df94c4bfc1b723d76c3f4bd3e4ba9fa2cfde SHA-256: 8cae1f6a37fa89b42b77048a9046b3f389c665c08d2ab6d459aec8c66baf31da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, containing numerous external URIs pointing to various domains, likely for phishing or malware distribution. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a campaign to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=shelem+card+game+for+android PDF link annotation
    • http://lamekatus.com/uploads/ckeditor/files/demulifizes.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/forulikidujike.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/jolurezaxub.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/duzikovuxodokowujoj.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/75834181529.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/16136236478.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/63270738128.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/vubotawavowetas.pdfIn PDF document text
    • http://entrackintl.com/uploads/rubanub.pdfIn PDF document text
    • http://kelvista.lt/images/files/94367725524.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142a56c142ea---29470242417.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210916044852.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/41641004530.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/53149998258.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/34269705628.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/gukulowefukizanuve.pdfIn PDF document text
    • http://maxbrio.kr/files/files/buwatumubodekug.pdfIn PDF document text
    • http://skupka23.ru/upload/m/gomumovewawuzejezukiwo.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/78382154854.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/lanurugilogixiwaf.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/34245601753.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/27202622605.pdfIn PDF document text
    • http://cartopack.be/Images/file/widokuxilagunobil.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e71ce720---92921287899.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/90901591606.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_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 17028 bytes
SHA-256: f81aa5dbf80b232e25142e44abe63a73dbd393e72ea2f75c18a3c0a38896101a
font_02_sfnt_off00012671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 10732 bytes
SHA-256: 435453ec0964981c7a8db9d6e1909cc42094d116d3a058ea46ec8f6ad445b00d

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