Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dd3bbd032fcee8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 04:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 773cbadcc44943ca6188cbb332f0a0ca SHA-1: e4906f1b8abd33d6e01251bfbc53268029cd41b7 SHA-256: e6dd3bbd032fcee888c2eebe4f84b08b344cdbe32cba08ed493447d376207976
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous external URIs are embedded, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=tinder+apk+hack PDF link annotation
    • http://ttc-investco.com/img/files/fizupo.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/68621363318.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/dapedukiziv.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/fawifop.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/42538560651.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/45368864690.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/xurejakenoroxito.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/6064159944.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/zagexo.pdfIn PDF document text
    • http://gabortech.com/admin/file/sudorunutaf.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/satatisegamitejokaxapegef.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/22677724258.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tawexodawire.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ccdccf440---26258369556.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fawelojipaxi.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109030452072134.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210903_FB49AAAE865FBA19.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/17733619381.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/56561538345.pdfIn PDF document text
    • https://arendic.cl/files/41882333161.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/rijidugujalarom.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_off0000b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 16520 bytes
SHA-256: 085c09bc553f717b41c639ba9da268f2748013ff7549a8ea00f740df75ee69c0
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 10232 bytes
SHA-256: 00410e0f98ea542a088d9b1088a7ad05e9146ec088026b6d85225e09614bdb17
font_02_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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