Malicious PDF — malware analysis report

Static analysis result for SHA-256 b803b1e8c3057098…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 06:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c0e48b9c7a5ed6fe8a4b52cc7d3b150 SHA-1: c821169e2e3f7eefd81312751d6e4622ebcef328 SHA-256: b803b1e8c3057098200fe52d782838907fffd0b7d9810ea7047d34c0db2540d3
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of advance-fee scam language and numerous external links, including one pointing to a potential redirector, strongly suggests a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded URLs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=rupaul%27s+drag+race+season+4+episode+27
    • https://csp-pub.com/stockages/files/lenujesodup.pdf
    • http://xn--tnqz8hz5cb8l.com/upload/files/kesabokosavibig.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/newitekixamajafobo.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zesirudipejuz.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f2ca03734499d7cfc5ef355abe04759f/81607160558.pdf
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/53908169548.pdf
    • http://clubselectionvoyages.net/images/file/xenujuvatibaxozodakuf.pdf
    • http://hoanggiaphatland.com/uploads/image/files/87360297011.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210906_A6ABCD61BA5F2928.pdf
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/41696676898.pdf
    • http://fasson.vip/images/editor/files/momado.pdf
    • http://dpnovelty.com/upload/files/4869003259.pdf
    • https://sapsda.com/SapmaUserfiles/file/46051095256.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6ae4ea61---bopenosisixukijumugadof.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/tisifijinemumoxama.pdf
    • https://le27.fr/docs/file/41866992063.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/42207239272.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/15628856393.pdf
    • https://indiantalentjunction.com/milan/media/danuzusat.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/jekirekisixigobalu.pdf
    • https://crmsaas.dswip.com/ci/userfiles/files/93452120824.pdf
    • http://rydelko.pl/userfiles/file/41732402368.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/rofutusofudixegu.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_off0000c74a.bin
191d56483f474f1307d8171bb33043f1a537abd800b44cc1ed3cce91d29b2a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 18952 bytes
font_01_sfnt_off0000f899.bin
a8ed200a98df76b229c58219eccbc21b1305cbaaae1c6528d8cdc957e58dc79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 11020 bytes
font_02_sfnt_off00011241.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 16792 bytes

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