Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40dbbb20b47377c…

MALICIOUS

PDF

91.8 KB Created: 2021-09-14 12:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ca587381438b000d61a6d7213bc1629 SHA-1: 0f57baa6e756a02295fd1cca1a0017c99573c4e7 SHA-256: e40dbbb20b47377c80d68f55b2289f8d707e1b8cc4001652f9867b7dd4401709
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external domains, many of which are unknown or suspicious. The document's structure and the presence of many distinct hosts suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/zoxuwevim.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ac390520---5801368853.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/41844355440.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/64284236638.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/derisuwirew.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/tefiguribuxegunagurijape.pdfIn PDF document text
    • http://torgoborud.org/images/file/75964999377.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161338e34f1a33---50377523728.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/jotetixinuj.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mibutazefepokutod.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/wuded.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109011044123701.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/93392278437.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vororimimomagesiveve.pdfIn PDF document text
    • http://th-hl.com///upload/files/60812041587.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210901230845.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/55875137230.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/juvojulofi.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/foxibafefixunofazita.pdfIn PDF document text
    • http://balone.net/_upload/file///xogagefafisebagabivat.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/55479885641.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/13157282282.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/67062854452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=new+bollywood+movies+online+2021PDF link annotation
    • 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_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 19444 bytes
SHA-256: bdc3c3040adf761076e1a1db4d2cc3b70e9f4d8c5ffb7f4761839c65fba27308
font_02_sfnt_off000148e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E1 10728 bytes
SHA-256: cc8851c3c446ee546b12e68811b44a2d4fcd09e2ac5c5bce008b4c0c88d25d3b

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