Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a77a71c65c835c2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 02:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64385f5317ae173830a0195c78756c76 SHA-1: 482d5d3be8394272d9654f831dbceb86a56c6379 SHA-256: 0a77a71c65c835c265b82f27994af918ca05de7b1c1f5ed4e0a3a5418a75d9d3
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=gta+sa+cheater+apk
    • http://yusungchart.com/userData/board/file/89447539898.pdf
    • http://architectureanddesign.it/userfiles/files/8056201927.pdf
    • http://forter.vn/hinhanh/file/91018641948.pdf
    • https://markyatirim.com/resimler/files/79351564947.pdf
    • https://sadex.pl/fck/file/saduwazixuvutafanexidurim.pdf
    • http://geostudio.eu/userfiles/files/fagapog.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/22822037121.pdf
    • https://www.prshots.com/ckfinder/userfiles/files/wirokijelikexeroru.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdf
    • https://stepweystudy.com/ckfinder/userfiles/files/nusubavanokaxetube.pdf
    • http://hrdiborice.cz/erucom1/files/files/mozisusewiwoj.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/xisilev.pdf
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dalolorazapatinipar.pdf
    • https://ccaquebec.com/userupload/files/bujonalabami.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/tananu.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/bilavununoribudowosol.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/zijuveminefabida.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/91849844489.pdf
    • http://nesthomes.in/userfiles/file/70264023529.pdf
    • http://medtravel.lv/images/hand_uploaded/files/dopubupadoxifotuvez.pdf
    • https://braus.uz/images/shared/file/77608235076.pdf
    • http://songdolandmarkcity.com/userfiles/file/zebifipazaz.pdf
    • https://edgecs.com/documents/wokikilezowuwovodixefiwas.pdf
    • https://leosservices.com/userfiles/file/23031657798.pdf
    • https://ecpa.fr/uploaded/file/70666118616.pdf
    • 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_off0000d017.bin
2ff348d19949acb1a1af42845b4139a8ac28ee28fab9f0f517f740e30dd8cb00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 10240 bytes
font_01_sfnt_off0000e750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
font_02_sfnt_off0000ff62.bin
b99fff166c156465376b41a620eac6bdeabf348b92e4d867888efbe0abf974d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 17404 bytes

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