Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdf70ad62c10887…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 09:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 181e88664c087d79814b9db1c08f7876 SHA-1: 9a824f2db826eedbd7c1f1d17d721e852458ffd8 SHA-256: 0fdf70ad62c1088742ce9b21ab85cad44274658160dca58671497e5b7d6e89a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or lead users to phishing sites. The file's structure and the high number of distinct external links suggest an attempt to obfuscate the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://videofilm-tv.ru/content/File/ririzivov.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/gamobiwinesisowataz.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/nosazigipem.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/vebosetofaka.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0d267e6e---95998591990.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/fowijebaxugasoduwukufan.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090922304273499.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cbabc157---manafebelebezazogoxuv.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/89710214466.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/97340899326.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/wolitagevukeruwepiraluwo.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/96532647878.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/15201845094.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/39103436142.pdfIn PDF document text
    • http://cabini.it/userfiles/files/joxugufukugijivida.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/dobijala.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/13569142960.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/3730075868.pdfIn PDF document text
    • http://soc-in.com/data/media/files/witor.pdfIn PDF document text
    • http://belean.pl/userfiles/file/63416175620.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/18745012259.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/67672859567.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/14302948089.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210913_7AAB264584F91A2C.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/kamubijefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hard+reset+samsung+galaxy+note+3PDF link annotation
    • 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_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 18472 bytes
SHA-256: 303fe32894097698235e0f15de24e4918cc4bbf2ad5de9397fd6e863ce1b8000
font_01_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 11168 bytes
SHA-256: a4e851aa50ddc8ac9e85d34de5974ecc04846b98feddc314c9e05c34bd177f74