Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27228bf76e2cb4b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 06:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 528cf2f17422780956fbce7e2649dad3 SHA-1: 238beb05dff16a07636df1edd22f871cceb3a2e3 SHA-256: b27228bf76e2cb4beabe34853e8e640bee7ddb5ec630beabe4faa04af5e7b474
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 a large number of embedded URLs pointing to various domains, many of which appear to be disposable or low-reputation, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cafemocion.com/userfiles/file/94390439827.pdf In PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/41670494264.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/32286300703.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed2c3d9dc7---66254069634.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/savinimim.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/7077843449.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/70956580916.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae4f38906---27286188295.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/23390466797.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/84431318460.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/56228871234.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/reximujotamapedobos.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/78878429104.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/lebuwafosolurumug.pdfIn PDF document text
    • http://hainfelderteich.at/27089964362.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96996072186.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/13891848455.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/96048059876.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/fobasozefuwut.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/kedutuvixigexolebig.pdfIn PDF document text
    • http://davcpundri.com/css/file/49711673107.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/rivewiwevaji.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/tapozusorek.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/sajoved.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/girawamazuvoroxujina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=african+american+english+a+linguistic+introduction+pdfPDF 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_off0000b4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 15692 bytes
SHA-256: f88f2b6952c40eb9c158e1c2b1273ae1a8eaa65443a70eed732db741f3bac28a
font_02_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 11148 bytes
SHA-256: c7dda8bd1aedbb92b01ce55cb51962405f8a7f731625552d2fb319cfad158be2