Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a8fa51989addce…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 14:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c6e52e379b3fde261bc72e785cd4327 SHA-1: aea16fbf05b52bb742962e3fa67d892e76917f86 SHA-256: a1a8fa51989addcef8980a610987b0f023647dda67d3d68034590d71f80f82e1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and multiple external links, including one to an algorithmically generated URL hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a second-stage payload. The presence of JavaScript (T1059.007) suggests an attempt to execute malicious code, potentially leading to client-side exploitation (T1203). Given the nature of the links and embedded script, this is likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0086dcb3e---86575978308.pdf
    • http://carzip.biz/files/uploads/files/zubuguvexasibiximof.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/41426948446.pdf
    • http://sukhonthip.com/file_media/file_image/file/42589378750.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/36186487911.pdf
    • https://beaszemin.com/files/32346875985.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/xelodovimevezalituzizawuk.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/nakodi.pdf
    • http://angelcabrera.com/FCKfiles/file/50521692763.pdf
    • https://raovat72.vn/uploads/news_file/dazilemipuj.pdf
    • http://carszana.com/image/upload/File/nanogezaxupawedek.pdf
    • http://hoshitorionline.com/uploads/files/71782818103.pdf
    • https://swaarm.de/app/webroot/upload/files/tujoxutu.pdf
    • http://bankerz.in/qpic/files/77886741463.pdf
    • http://csc028.com/userfiles/file/20210908112450_evfofd.pdf
    • https://cantellodetersiviprofessionali.it/uploads/file/13258637912.pdf
    • https://mchs.kz/userfiles/File/pivutukomosoned.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/30418984308.pdf
    • http://mmckno2010.zkosuchdol.info/files/44542838890.pdf
    • http://flairpens.ru/uploads/files/wumexog.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/mezefevuxezogozaruva.pdf
    • http://freeorden.com/media/file/tubegilixesel.pdf
    • http://meghdoothsuzuki.com/uploads/80081307547.pdf
    • http://paillasse.hu/userfiles/file/jizisusosewuduleno.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=moba+legends+apk+offline
    • 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_off0000e350.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16792 bytes
font_01_sfnt_off0000fb67.bin
a5b53c8db7d8e4b0050bb9b6dc4e0db43703aaf382594674af410a3df4b9b690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 10700 bytes
font_02_sfnt_off000113a0.bin
fc5af4e828154bef7da8247606656251408c296180673771f012a7f12a1f0437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 18768 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.