Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf2953c4de3a3c1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 04:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5b01710db25ebfe2198ca8f5bb0782b4 SHA-1: 34d0732eea03fd172d5c4af917d61b8b49ec036a SHA-256: baf2953c4de3a3c1f3a3df69dc13014ff0f217f4e819c3cabf51e84c1ac62070
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=s7+touch+sensitivity PDF link annotation
    • https://marbletreasures.com/uploads/image/files/78669398118.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56448980f---154871232.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/xowaxakonedutu.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/99820009267.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/89397329911.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bb7c3175---binokurodogo.pdfIn PDF document text
    • http://specialcats.nl/media/files/lutuwuwuxovaduwij.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/totafagutepefukavopox.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/91150698653.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/20847157505.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/podulokezuna.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210917235257.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/85983413932.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/japijolol.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/letekaforikerux.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/domomufowutizow.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091214543973499.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631276767.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/49792077148.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916062520438520.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/20873318541.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/nufifodopolopix.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/vujinorepi.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_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10424 bytes
SHA-256: 6cfb6d6d9befe6b16155de82bb7c7d229bf6b9d70eaeebfe7b1beeb0dcbf1cab
font_02_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 18116 bytes
SHA-256: 7ad0e8d00efc9447f1341baa511069b341385e385e5a9bf0d740da15313a4f60

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