Malicious PDF — malware analysis report

Static analysis result for SHA-256 511aff7c5c50227a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 18:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc22a8d517c719d9ce23b3c03b346f9c SHA-1: 6931084be02e1e3c68a844a366d070db9415036f SHA-256: 511aff7c5c50227a877e57ccd25828debc117311da157e012c4e8fb6d74dc3c6
134 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials through the linked PDFs. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

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://droprint.my/home/ququ4923/public_html/userfiles/file/wowujuwowene.pdf
    • http://podarox.ru/public/files/26265442672.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/nafale.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/vufuleriv.pdf
    • http://geteffective.biz/uploadfiles/file/misuginiluwesaxivape.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/70578374843.pdf
    • https://tsydesign.com/userfiles/jws/files/vugedamugavox.pdf
    • http://bachova-terapia.sk/images/file/vaxurebi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131418167720---13301047007.pdf
    • http://szkolka-wiercioch.pl/files/file/didegowidogulolebuzadilu.pdf
    • http://gesgo.de/userfiles/file/delukunojufoxukoju.pdf
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/26351251842.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/87519761835.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131dcc77443d---semeretizibigoworewe.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/67077791909.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/vudubawiwu.pdf
    • http://zenobiacultura.it/userfiles/file///52992100786.pdf
    • https://sealand-pptc.com/userfiles/file/37909742016.pdf
    • https://fleschimmo.lu/userfiles/files/99996072790.pdf
    • http://gloteckr.com/upload/editor/file/tumepubitaxibogikoxavex.pdf
    • http://inkjetartandimage.com/Uploads/file/98625133408.pdf
    • http://duancanhotot.com/upload/files/wudodetugorazabudijesi.pdf
    • http://leton.pl/userfiles/file/283502232.pdf
    • http://hzjksj.com/images/upload/File/11597276092.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+iii+apk+obb+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_off0000e061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
font_01_sfnt_off0000f878.bin
69c4e1487cf9a3638e71123323b509593d48c49ca03d8c919d52fbfff07b4100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10344 bytes
font_02_sfnt_off00010fb4.bin
a5583f2920f086ef2fdef9f47bd41341d7feb6ed34b75b1dc2ae0d1966950140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 17964 bytes

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