Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a03bec28df2b70e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 02:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4018613c2c46ecaa4030665ad795a010 SHA-1: ced11b4c73227d144210be165a591b33d046aefe SHA-256: 1a03bec28df2b70ee0af76fec9231510fd3efa8052f0aad5bea5ed17164a895a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, including one pointing to a suspicious domain associated with a download lure, and a high ML classifier score strongly indicate malicious intent. The ClamAV detection further confirms this assessment, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=the+sims+4+apk+android
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133dff9472d2---89559394442.pdf
    • http://wsm.hk/images/uploadfiles/file/sonejejapumekute.pdf
    • http://vongtaygiay.net/media/ftp/file/77916958632.pdf
    • http://nacyc.jp/Upload/file/vejolabuwivegabemus.pdf
    • http://parbatsamajjapan.com/img/files/files/jatenugonuz.pdf
    • http://suliaox.com/v15/Upload/file/2021910148123141.pdf
    • http://myshopgroup.com/userfiles/files/92350215638.pdf
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/gurijixilogofozew.pdf
    • http://mhzsolutionz.com/userfiles/file/88937394717.pdf
    • https://artgreen.vn/attachment/files/87675676663.pdf
    • http://wiskind.com/filespath/files/20210907105738.pdf
    • http://yurisolomko.com/userfiles/file/88489708407.pdf
    • https://villanakarin.com/userfiles/files/31717805009.pdf
    • http://coreaad.com/DreamDataUpload/file/xefugilubomelaso.pdf
    • https://minipowerpack.net/upload/files/43521367007.pdf
    • https://livre-art.com/ckfinder/userfiles/files/87606718838.pdf
    • http://asacnfservices.com/ckfinder/userfiles/files/17022483904.pdf
    • https://clubon.top/uploads/files/95934995706.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vpm30uanj5omkigg52i4ffokg2/26784859800.pdf
    • http://thesciencenetwork.org/uploads/files/bomowutinadupemi.pdf
    • https://longhungphat.org/Images_upload/files/6186244901.pdf
    • http://doudou.tw/userfiles/files/xuzokopipovumewoxipusa.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/68833355626.pdf
    • http://mywayrtk.info/userfiles/file/beleje.pdf
    • https://bepxuyenviet.com/upload/files/47626291576.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_off0000decc.bin
df005e81a0f5839cf2cf4d6a7a6744544374bff509aa9482fc3bedc2a7cf7c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 17648 bytes
font_01_sfnt_off00010ccf.bin
65709b64103c1a20d2557c3960385c235e7b358d6ffcc66ac2068d2a0f886208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 10648 bytes
font_02_sfnt_off00012500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes

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