Malicious PDF — malware analysis report

Static analysis result for SHA-256 66086ec29f2aba3f…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 21:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5027a52d4667bfd33848aa3940a99f50 SHA-1: 6f0bbcd750dcfd771dd16c2449d7653a9787c32b SHA-256: 66086ec29f2aba3fbc21faae4e9bcacc0b30dd05ffbddd61a1c7a441cce33d6f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical of a screenshot lure. The document also functions as a link farm, directing users to numerous other PDF files hosted on various domains, increasing the likelihood of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fisheaglesafaris.net/pics/user/file/pasulagalipewuzaj.pdf In PDF document text
    • http://mnwebdesign.dk/userfiles/file/31527632081.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/5615974209.pdfIn PDF document text
    • https://eniedu.com/data/file/20210916150815.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/vebub.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogisudurivabirakuma.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/luliw.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/32177541086.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zobawivezabegikafajodudug.pdfIn PDF document text
    • http://swhos.com/upload/files/rumofodowirowuma.pdfIn PDF document text
    • http://nissan.e-library.tw/uploads/files/wadusuvovuboginoki.pdfIn PDF document text
    • http://p-energo.ru/content/file/81624988260.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/pejowulonemisozofik.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/mimejewalivowevigave.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/98320970332.pdfIn PDF document text
    • https://granitnet.hu/editor_up/14585444179.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/46648683710.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/5895363611.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wadoretabazawifeganazo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613138f0156a8---dizuzesudibasulij.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/73625150283.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/zanepelebefafowesifelewen.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/donod.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/fejerato.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/donulibup.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/16945589820.pdfIn PDF document text
    • https://kaimano.it/file/17511135705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+set+external+sd+card+as+internal+memory+in+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_off0000b582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 13996 bytes
SHA-256: 3d0c06777c9ac868b1207f0fc29e8c33bf092b139b395f0084beb08308be6fac
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 10824 bytes
SHA-256: 92a55d4817644c45b5d9bdca59c910da2d9daa0de9c7e42f351aa2fc7d72c95b