Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a85150f5b1769f5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 19:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4d235a40e666a86891a18424cb63e0d5 SHA-1: 9d1b865dbd4c2dc353b946bb2888fd283e86a5cc SHA-256: 4a85150f5b1769f55620c948efe6d6e17e188cdc89a78fbdb5f0b1e3426dd273
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are structured to appear as download links for software, such as 'photo resizer pro apk'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade security gateways. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=photo+resizer+pro+apk PDF link annotation
    • http://hepiran.com/cache/fck_files/file/ramarurozizot.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85962123575.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/87790994505.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/37291451549.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/wegizivexido.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/62624655769.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/69708384439.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/27866843318.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/rorimazegixa.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/58712040676.pdfIn PDF document text
    • http://hongdacable.com/d/files/34892487545.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/12783437321.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/gesutoporavajaxo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/64869345183.pdfIn PDF document text
    • http://cortabellanews.com/userimages/72513388094.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/de24a773ce4b90fb44ea0390d2eb9790/bexiripiwunigo.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/mebakajom.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/14153873864.pdfIn PDF document text
    • http://sbairs.com/datas/files/sebuzilalirijaxidabobeve.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/39403490692.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/iqvp8101h7jq3ij7jebpdo1inv/99491770685.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/12910452252.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/46133760845.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/wogakovutilijuxifidoxito.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/74811651866.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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 18888 bytes
SHA-256: f2178974928ccb4e4d49b496f39a33248a320c78ca6e849fdddc51b535da9ec0
font_02_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 10352 bytes
SHA-256: 0d174d3470ad338f2fcc9021e939c92b2ac00cb77296d1f0860621ddc3e0c015