Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd68e3aba569966…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 09:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f12a524b55d8e8c9cd5d20ade8d46b92 SHA-1: 685ddc168507d0c2bb5e6bd181401763afaf77d6 SHA-256: 0bd68e3aba56996600a01c4832b3f85f030c76dd605e91c8ae994fe3d263940f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or SEO-based distribution tactic. The PDF structure itself is also noted as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ofly.om-digitalsolutions.cn/upload/files/9136827337.pdf In PDF document text
    • http://rintoyo.com/userfiles/file/besaxupew.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210909_183748.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/gogevuvevexasefalajejo.pdfIn PDF document text
    • https://suksesunited.com/contents/files/60240328110.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/logibinuni.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/wajin.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/laladobudegabusavaliwox.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/96594445475.pdfIn PDF document text
    • https://gulamanis.com/contents/files/netonegugod.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/63770149597.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc39a47d1a---kitelomutexirute.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/145240818.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5cd789182---mogipukapudepewevuda.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/rimikagisolunexoxutuzid.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lagudedovetiweja.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090407433687.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/27611665141.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rezukefanebipuw.pdfIn PDF document text
    • http://hidramaco.com/files/files/78614236125.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/12088717311.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/98736580846.pdfIn PDF document text
    • http://irinabailey.com/upload/files/nifapimufodusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+guardian+1990+full+moviePDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/tonimurozojuvezewamuge.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_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 11008 bytes
SHA-256: 4fca02217e29f129e141dce961bf032449525de1649c47d9cbf8a610120a4722
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 18452 bytes
SHA-256: 5b271da2e55ff10dbe7bcfd89ccdf9d1bf27316b9fbfe5848802ae6bca8bcb96