Malicious PDF — malware analysis report

Static analysis result for SHA-256 511bdc52c2396148…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 08:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bf6969bda1242cacad15061b2759e2c SHA-1: 0b93d53254707cb112335189a0c33f6ec5d5b47f SHA-256: 511bdc52c2396148c663c1e5884cc467def2228bd6bd8fcc38d83dfab8cf1d60
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of embedded JavaScript and a large number of external URIs suggests the document is part of a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • 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://chcial.ru/uplcv?utm_term=how+to+add+emojis+to+photos+on+android PDF link annotation
    • http://cw-cut.com/uploads/file/91397188093.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/jasibugonigepidovunoseb.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/96553948743.pdfIn PDF document text
    • http://qdjshg.com/files/file/dakalesexapupusomokiledu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613f914646c66---setojadoko.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/55641072705.pdfIn PDF document text
    • https://membermimpi.com/contents/files/57385368314.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/68556366375.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/78861240455.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pitukesatopexulog.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bcb8078cc85635f8e2458fc7159ad8d2/82081827435.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/liral.pdfIn PDF document text
    • https://netlandschool.cl/files/juvopuvepezotavuxogosemaf.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/ridotugodoniwa.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/4580199788.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/56504911150.pdfIn PDF document text
    • http://eksternest.be/images/file/73945440482.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/zejenoxozelabezij.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/xazekepakugufalome.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/53445029951.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/13641556795.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909125128_9ol69m.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/televipugovo.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/96050901534.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/voriwomifire.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/ridedoradinumenude.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 10816 bytes
SHA-256: 397931ed6e9cfa8b33885ed2754a775b2dbd2c74c2686ad43b3ccc99211bf422
font_01_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 14296 bytes
SHA-256: 8971a9496c260d12d21278750f7c72339976a83283546e12cf8bd3cba7720ff3