Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f80623271e91cb8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f492b736e05da19ed645f9f34869c005 SHA-1: ca509bdc7d9e45116424351dbac816756d8831b5 SHA-256: 8f80623271e91cb84cea888565a157e104c768f1333153a98456e5d9cab606a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to multiple domains. One URL, in particular, is associated with a 'picture insect premium apk', suggesting a lure for potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161354d583287e---reronufesugisevuxoxet.pdf In PDF document text
    • http://assotechne.eu/userfiles/files/35057792703.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/27481266872.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/sololujuro.pdfIn PDF document text
    • https://yasacompany.com/upload/files/gekosewivujotebepu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e00aaa5f---pilimuma.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/55725042403.pdfIn PDF document text
    • https://digireg.pl/upload/jixizaporazuberadu.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/labojefim.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/galawutuxodegenutebisar.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/xasareje.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/42716787273.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/253215328.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e90fb98c11c2e182af8defdcdc58c45c/rizunegiruvizomu.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/11931997349.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/86668289643.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/25587591855.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/mojubebogininigevaro.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/xusuvupamolixafetapukuka.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/52390341231.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/77596302976.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/97577743235.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-17/20210917202428388320.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/7685204433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=picture+insect+premium+apkPDF 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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 16124 bytes
SHA-256: 99fe837c5cb133de80d8d86151cf215397261c0cdca7bdb7d8732ae0cfbc3e90
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10560 bytes
SHA-256: 4be60039261fa2ecf3586acdd189951c43bf80fc5fc1aad97a67aa0321e5bb30
font_02_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1