Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a56afcded274069…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 15:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 580ac4de95b873b06c818b690ed99de4 SHA-1: 1c58f7be5d5fefff1df245bdeab2e57398dfbea3 SHA-256: 9a56afcded2740696e018c1efe4485edb1b6fb93e2f6911b40a8cb0bed4f11ed
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. Heuristics strongly suggest an advance-fee scam, likely using the embedded JavaScript to facilitate the redirection to these scam-related URLs. The ML classifier and ClamAV detection further support the malicious classification.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://synerhu.ru/uplcv?utm_term=human+fall+flat+apk+pc+free
    • https://el-tall.pl/pics/file/40534980130.pdf
    • https://limsurempat.com/contents/files/fotikaku.pdf
    • http://studiotipaldo.com/userfiles/files/lirowanukizubaromowivebek.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f563168d8---82717213015.pdf
    • http://extintoresorigen.com/images/editor/28332083323.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/lidevefukamu.pdf
    • https://izr.fr/files/50911488906.pdf
    • https://cfbadalona.net/ckdata/files/78335829687.pdf
    • https://035620126.tw/upload/greenkitchen/files/pikiviwaxexe.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/60943163448.pdf
    • http://synhbio.com/upload/files/60061459133.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/lovefadejedujarekadanakan.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/78785029710.pdf
    • http://precisao.org/files/files/surejoxatoxarodusi.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/87067271928.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210908_184242.pdf
    • http://tipiland.net/upload/file/34817392659.pdf
    • http://thessalonikiflights.com/files/files/51822333752.pdf
    • http://yongqingtech.com/d/files/furimezamapenedija.pdf
    • http://med-os.com/user_upload/file/46472263902.pdf
    • http://mos-craciun-inchiriere.ro/fckfiles/file/98216444309.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614046ac75bcc---buruninewojenojixu.pdf
    • http://vanxuantravel.com/upload/files/5753008430.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/nisas.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_off0000ea19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16792 bytes
font_01_sfnt_off0001022b.bin
cd4032081a6b6d93166f789d7189ebb313467ff1c728760203fe43d2e664ccc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 18056 bytes
font_02_sfnt_off00013189.bin
d639514ccff7f7054b121ca5121fc348d03ce3f70fca6c731cf7d241830fbe16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13189 10444 bytes

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