Malicious PDF — malware analysis report

Static analysis result for SHA-256 394f11a1ebacc4ce…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 05:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3da437309bd9689e8ed34e07dfda872f SHA-1: 38fbb83dbcbd2214e7c5deba6d79df2b1996c7bc SHA-256: 394f11a1ebacc4ce55f087955d1161bc0a21b8392b2234725eb5a7b1a9015a45
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting the PDF is a lure to a network of potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://elai.kz/upload/2021/09files/210920074807333897trih2.pdf In PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/digaxevededuv.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/pomigoguti.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/jajipaxavifoxutudim.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/pagiki.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011916115209.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/zatewifuvanevotug.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/24272983738.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109141410460408.pdfIn PDF document text
    • https://endobible.com/userfiles/file/kogeta.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/fogakisivol.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/78056942998.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109020548403885.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/36956366301.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/vifuzapijojif.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/95947149027.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/4a84c9f174b9bcb2ad0111316b7dd5af/54532171312.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210919_56924619F63F2BB1.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/94313543893.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614903a99f2e5---fajipoji.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/11312856326.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/xotowebugurifinisefut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=offline+rpg+games+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16696 bytes
SHA-256: 0d78f314c0b734fd5a6312144e20bccbc222ff505a37026e85199816c879e75d

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