Malicious PDF — malware analysis report

Static analysis result for SHA-256 8785880b5d1d13f5…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 00:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a68c0d89e9a90fa3da56df26fbfb5dbc SHA-1: 62eec8450d75d727976e99fa30d897589ef79e09 SHA-256: 8785880b5d1d13f5b0f6da5a810f90cd199e15986bf74dc6302923f11115b2a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on potentially untrustworthy domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest a phishing or credential harvesting attempt.

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://allytemp.ru/uplcv?utm_term=how+to+get+free+space+on+android PDF link annotation
    • https://coastalstudio.com/images/main/file/83877176006.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210908_113432.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/57664221540.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d03fd43dc5d022d12b7d97b4fd958206/18177719068.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/zidojesutinururozumiwat.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/kixirutovitinotuva.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/31243401491.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/83568964125.pdfIn PDF document text
    • http://muszempilla.com/files/file/42668528658.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/54660141222.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/62118999407.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/70001951015.pdfIn PDF document text
    • https://12shio3.com/contents/files/zegomowamisiduxel.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613713d9efe0b---jarolenofaweroxaredufesi.pdfIn PDF document text
    • http://rts-3.ru/upload/files/14687769703.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/48680886385.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fexunakibavefomaluriku.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/godinawojugabuzara.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a311ca4c4c---12964814157.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/69653852532.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/43896409492.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/81271767560.pdfIn PDF document text
    • http://e-menu.hu/editor_up/3746370875.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/35360709084.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_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 16684 bytes
SHA-256: a6012fa63e274a81facc428db2e09cd8c45174772c1d6729f0506efd79f13ece
font_01_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 10824 bytes
SHA-256: d57bb05f167e86ddc85c28d4b510f956b6fddccb56777133fb1d61d17b90a58d
font_02_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1