Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaaffabcb4fd635…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 23:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a10ebc9d7d5272dc672beadc7c833f89 SHA-1: 616dbd65b7eda8a8cee0d57147333a3611582aae SHA-256: fbaaffabcb4fd6358db94eac30c3c5b8ce6a1e320e12898a15604b0ebb257149
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for hosting many links on disposable domains, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=kuroyama+hack+diamond+ml PDF link annotation
    • http://hungthanhauto.com/luutru/files/jukivigofuvizufilizizu.pdfIn PDF document text
    • http://ahknchem.com/upload/files/74909414931.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/naxigetepi.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/17502996740.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210911_C5063926958AE9CE.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/piretefaxuvunidatalise.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/96263112650.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zasepoxirepalowi.pdfIn PDF document text
    • http://abnicum.ru/files/file/wizelosebeku.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210911135638.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/zejubujuxizavalipipugof.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210911041524.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/dutelixiga.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/65015538435.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hhetvbqu7904o31350ntn3jiu4/1465031322.pdfIn PDF document text
    • http://www.bash.cl/media/file/lavefinivoxizazisag.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/jubikiwajiva.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/90439027610.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/defomil.pdfIn PDF document text
    • http://belloverde.net/emailer/file/90226604926.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_off0000b481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB481 10536 bytes
SHA-256: cc59e431d01ba4efbb66a6c4c49501943978015713fb5156c8ffe4835b759355
font_01_sfnt_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 16732 bytes
SHA-256: 84a1466f511a33617737c467f18df6b4778cacaa7c993e1c8b195b32df578453

Open this report in the interactive analyzer, or submit your own file for analysis.