Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd3c3ddbe93d921…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 11:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bafd798ce4672fd661b11166ae9bb376 SHA-1: aa839b7b4c06753f2dbc7ea3efeeee3e4667a195 SHA-256: 1cd3c3ddbe93d9216eefbc0f6f82ed2bf7051871e4a1511a70c12f3f50573742
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a payment redirection lure. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded links indicate it's designed to trick users into visiting malicious sites, likely for financial gain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://philabc.ru/uplcv?utm_term=comment+synchroniser+contact+iphone+vers+android PDF link annotation
    • http://thuexe7cho.vn/upload/files/setok.pdfIn PDF document text
    • http://yuha.be/_files/file/dapirexizo.pdfIn PDF document text
    • https://wittnebel.dk/file/88479616460.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/21723881500.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/zutowoduni.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xunizanewabositawen.pdfIn PDF document text
    • https://mashura.co/userfiles/files/23137974682.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/givenavoropavidodem.pdfIn PDF document text
    • http://upakuika.com/img/file/pupijaj.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xabolixiposuja.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/92205696468.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905070908_2146772145.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/69592828508.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/44504809133.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/vejelabadalukebadagox.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/lesoduronorifopoxomusuli.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/40907079144.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451e24bcd40---43665928712.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/munetozorigopibobiva.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/83401473837.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16142f9a2a6379---82154105694.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/jafubupujuwadumalep.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_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 10944 bytes
SHA-256: c4bc6ff0d77a09fd05b3e39c51d9f02881d83bb563e902e7910c667a43c89521
font_01_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 21016 bytes
SHA-256: 512d3e3e472631f5a05078bc0f24f9e20d90cd901fd6b3bea530c87a99b4cd2d

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