Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf7e669fb289a54…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 10:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 303cd27331caefbb0228ab2fc0876393 SHA-1: 0bd69cfbe931ca7403943ba3c5c6cb0ab3c871cb SHA-256: ecf7e669fb289a54effba16f41eda18ac7ecbd8d8a78cd2ec500138bb3347d5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=omigod+you+guys+lyrics PDF link annotation
    • https://jerseyshorepirates.com/userfiles/files/97799840172.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/18527984964.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613caad50bb76---daranonuwavozajodij.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/2953476080.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/mulabesoralulitilopapu.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/61852815768.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/nukupizisepuzejipo.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087803759e---migawixegi.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/36371854487.pdfIn PDF document text
    • http://gestioniarmatoriali.it/subuvugefejamemi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/numokitajaza.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/39797829704.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/misezokizunatelazopopo.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/gisidovepanaz.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87870911255.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/73632200990.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/41971642055.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/ribokikavufimagobuvo.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/wesarolipolugine.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/43449099086.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/46077690401.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jajaripewo.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/74090686094.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_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 10456 bytes
SHA-256: d05e6b6eb7d39427af13957a13bd8153724d7a550ee1112b70b1805f8bddc935
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 17656 bytes
SHA-256: a288ea719db38a066cd80e4db1b3f75d448eac44f946e1d29e80b8da13ffc754
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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