Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c060dd1ad81cb4d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 14:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c2f1264153e922b2255a8db7f044c5f SHA-1: 1ec9c79676c7512d4fa159619c02be1f000ee415 SHA-256: 3c060dd1ad81cb4d0f7e303e4649738ee2cd0100a604c9a60ac4b1c0b2f2959e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to link farms on disposable hosting, suggests an attempt to obscure the ultimate destination or to host multiple payloads. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lamachine.nl/userfiles/file/88552243474.pdf In PDF document text
    • http://steakpluspizza.us/userfiles/file/10976059453.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/48596694738.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/dinanozelo.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/41427449717.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sezibafe.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/ruwizokavobo.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/dulepetolipaveve.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/93687228586.pdfIn PDF document text
    • http://standardamulet.com/files/files/22625136492.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/51015636776.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/08212200520.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613627d1cb79d---tuzipijojovav.pdfIn PDF document text
    • https://aneri12.cz/res/file/sevawiduxivuvafafufe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341300e79ce---mipesugalujux.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/51764732140.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/megupupaxosajit.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/63517568040.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/45046507015.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/80009728566.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/saxibek.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912015939.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/bukigisu.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/28396922653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=app+to+block+unknown+calls+on+androidPDF 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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 17396 bytes
SHA-256: 95914bbba77526829edc45c2cb269a54cdbaec65f15a73811746b42dbe2050ef
font_01_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D66 10776 bytes
SHA-256: c9bee2064ed51d232e6da4f2ebe8f43f165b7b43546c23eb934d376334f2caa3