Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0827a8a760688d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 04:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10d73c8acc02bb944d2f72137a2ec167 SHA-1: 0a76d09bad24a753f3873588d6b70477cdf65b01 SHA-256: 8d0827a8a760688d9e5f02d852fded0a14510f471ae412a6a2c3046c5c9d913e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains numerous external URIs, many of which are part of link farms on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=mu+origin+invictus+mod+apk PDF link annotation
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/56760220499.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/dinijiluwelovozamifazetij.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/12230556530.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/takezesugenij.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rodbrord6n8r7v85bdohag36bc/gedivivowemijebube.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/15056391622.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/64835204098.pdfIn PDF document text
    • https://granitnet.hu/editor_up/mipevakejorida.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/39424544206.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/55025340169.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/sepatupefazafef.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/78433631148.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/99482002738.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/69691796300.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/nubaritujorilurego.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332e83cea8e---rokamefoxez.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/xutadepotasade.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/bobabamulutivi.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/56515504230.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/pifixoro.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/69874768613.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/86553307759.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_off0000c154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD966 17836 bytes
SHA-256: 15ded64e0cbc426b828603b04c44caa06b07f8c2063278c5eae79d79ff8be800
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10932 bytes
SHA-256: 633c6df409f3358cf9b01b7008d5f03717f3dee796e5870932072519fcd6948e

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