Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c89de2eacd2cfc…

MALICIOUS

PDF

85.4 KB Created: 2021-10-12 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3b85f251153fbeed63eccb77b35f3a9 SHA-1: b78cb1e504ac3a04676975e3c9215a3aebc93260 SHA-256: e8c89de2eacd2cfcf98c46b8115a1194af82ebeb885594e25f80f62e3036162a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable or unknown hosting. The document body is obfuscated and likely contains further lures or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://alemotta.com/resources/original/file/89183199426.pdf In PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/begera.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202110090021406687.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/leropawizipiboji.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vatubemuvusubob.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/44066476236.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161607aa81f0ca---savosomus.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/ziwijatugu.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/16234425339.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/getaberof.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/vujexubitukuwewapov.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/57287913935.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/16457508943.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/74112949785.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/94832727323.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/24741634014.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/mubanezow.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161510e267e9a5---46718273561.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/14539024805.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/11727915257.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=lester+hayes+hall+of+famePDF 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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 10356 bytes
SHA-256: 337f9a75f9bcf96d418c130817442f5c4fd357ca7a85a1a50aae658ec80d7466
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 20108 bytes
SHA-256: 55afd700102a89c75af363b53f1cac8dfcaa49db2a7044cb5fa41549cf27fb2b
font_02_sfnt_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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