Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d4b2d786591fc4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 14:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 219701465a7e7d7646a37fb9b1ad9f43 SHA-1: c509f9297a86c25cfe4f1604ae365f9decc77832 SHA-256: 66d4b2d786591fc4c3a4e4590f51ec010b75e18f6872a436910ce8c01d03a0da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://dissanna.com/temp/fckeditor/file/91301922885.pdf
    • https://piphoto.tw/uploads/files/202109101533038409.pdf
    • http://coaching-scolaire.net/userfiles/file/mivugi.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/dipajabolumetilex.pdf
    • https://coluer.ir/documents/file/gekomugumemiwogefu.pdf
    • http://aybar-gallery.com/userfiles/files/loxud.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/64473902183.pdf
    • http://danguykhoidoanhnghiephp.vn/Upload/files/47946779145.pdf
    • http://budget-pl.com/ckfinder/userfiles/files/79523787179.pdf
    • http://menifee.hanasushichoice.com/uploads/files/jidaxenegeborufaxuz.pdf
    • http://benthanhsgfarm.com/images/uploads/files/52079831631.pdf
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/22663585838.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/40507834043.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/80746914323.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e2bad80a7---30705954105.pdf
    • http://thai-apsproducts.com/file_media/file_image/file/semixexela.pdf
    • https://tahsindincer.com/upload/ckfinder/files/tefiruronumidif.pdf
    • http://pozitron-s.ru/userfiles/file/52033845932.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/20900314725.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/ratirobusutavizizunatemar.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/nodanugodarikivo.pdf
    • http://sino-web.net/filespath/files/20210913071916.pdf
    • https://zenithservicos.com/userfiles/files/656230010.pdf
    • http://rutka.pl/media/upload/files/a6dd768775bafbd637a150e00ed6b240.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/28225999728.pdf
    • http://phdpecs.hu/userfiles/files/1219853700.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=luxury+train+simulator+apk+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2c1.bin
14d711b4d4e2ead292c3ce96c49fd5c24009466ab5b7b64d3e8a35b94a6a5458
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C1 16336 bytes
font_01_sfnt_off0000dc4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16792 bytes
font_02_sfnt_off0000f462.bin
c8a081106901afb079c16fcccd3a6f96268a827d2d55d358e780f78068843658
pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 11108 bytes