Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa3e17e799be8c9…

MALICIOUS

PDF

70.1 KB Created: 2021-09-29 07:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8d30c57a208d23c8e76ff26b4ba2bb2b SHA-1: 84322b8746793056486e653e9b7e57b0efa624b3 SHA-256: 7fa3e17e799be8c9decd3878827cca85f76bb5dfb59e4b641301776664ecdccc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs, many of which point to PDF files on various domains, indicates a potential link farm or a distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autosoftware.company/autoresponders_images/files/zitegazafena.pdf In PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/17641404891.pdfIn PDF document text
    • https://reniuved.it/file/zulaliduruzanuvarilev.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/kexifapebete.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/rawuva.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/manazikixavesiwumezetan.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109272330011205.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/mupolemadixates.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/lowitog.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/pezuz.pdfIn PDF document text
    • https://hobbypet.cz/files/file/30497974526.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xirirejetukunowazerogus.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/bojujonijurumax.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/38261050888.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/96988427825.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/33365918750.pdfIn PDF document text
    • http://myarchitect.es/ckfinder/userfiles/files/61063664455.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e701f486879166475f5c64e6ba9136a5/6858049185.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/74061646274.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/valufafewaluma.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/77440496323.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/tapuvizulanomapejugaru.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/diravaduvanabigufexa.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/pewakosu.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/lejasexerimexabaza.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/70830940016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apk+game+store+gta+5PDF 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_off0000b488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB488 10560 bytes
SHA-256: 99757b6b572a87224ba2d77606b3896ad43baecce67c4dd2893450682f636559
font_01_sfnt_off0000ccd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 14460 bytes
SHA-256: c30cf8c14d3efcbf25366fce98745355aa0881457dcfdfdcb9486868bbb5c229