Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdad77b5ced3873…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 09:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 287e9fa8c4542fb278f2b895d5b49149 SHA-1: 61f68b3778768112f829f5ffbfd2a7b47b785da9 SHA-256: fbdad77b5ced387307fecf2394e6e01152f0721aed3924f7ea3f75b37b006b4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://zjleiou.com/images/upload/File/pejine.pdf In PDF document text
    • https://majubesar.org/contents/files/41466887147.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/77259076289.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/376986548.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ac44dbc6---43480472820.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/93649957109.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/75659720000.pdfIn PDF document text
    • https://renewone.de/files/kokipanuvupirij.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/jimofawozaletuxolewogox.pdfIn PDF document text
    • http://live-net.it/file/67161774966.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/71816937351.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/jisufed.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109060753327223.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/20185503374.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/12912216357.pdfIn PDF document text
    • http://wsm.hk/images/files/xizugev.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/22114259219.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/lirugadaridekisi.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/5672528321.pdfIn PDF document text
    • http://eva.am/files/11161d5d66086186.pdfIn PDF document text
    • http://agrion.org/upload/fichier/garavufukuradabegatupuv.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zanodaga.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/desatilixanitefi.pdfIn PDF document text
    • https://keongracun.org/contents/files/rotuvexokip.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/66537990009.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/17477905709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=app+download+manager+apkPDF 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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 17240 bytes
SHA-256: dcd24bd66f67087b72fe53cb101f0341274742b75584835b77240281222b5fe8
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 10536 bytes
SHA-256: 367722083b0f77874ab84c925e7dd7d093d86431d825f432e1bf5425d708b52f