Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1460444fb1c3b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 16:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77a78fe499f6d02a8262a4673b81c21b SHA-1: 13504503b5aaf3ca057a9fdca78ff783dbc7e422 SHA-256: c4d1460444fb1c3bda850c9a2bd2b51a2464da5af528bc8d5002acc0c19914d7
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tcsklife.com/filespath/files/20210903083720.pdf In PDF document text
    • https://protum.se/file/vixenulara.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/43131775225.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/mijuxazovapofa.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/bijobelusur.pdfIn PDF document text
    • http://schubert-hh.de/image/file/71409988597.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613617cf87eaf---ziledaju.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/zexoperamivopiredorit.pdfIn PDF document text
    • http://bienbao.net/uploads/files/pawedinibawukigovatuk.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/zuvim.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/tejuwa.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/dumexaxubupujigepade.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/36311942512.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/82250339148.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/72874609502.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/jexurigo.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/55748170430.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/xipujifiluvasiwu.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nuzuzerase.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/63759702959.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/joxozibafufipu.pdfIn PDF document text
    • http://centronegozi.com/public/dufomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cara+mengubah+word+ke+pdf+di+microsoft+2007PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE45 18328 bytes
SHA-256: ebcb8736a7a5b304482e3958aa94ca756279bb28d3fd63d98d0f854273ed3d6e
font_01_sfnt_off0000fe03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 17108 bytes
SHA-256: 1e1876ab0f82f3eddee866b75cbdd4ce50a1c52c4ef2568f0ef601363b0d9779
font_03_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 11760 bytes
SHA-256: daff4d1bfc760308a3e0ae9008bdf20b62fc6f6a4fbc8a016e930e764fb061dc

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