Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb22ca5882107ed…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faa3d9673afe6a24d0d501693e446822 SHA-1: e1d57d7caec3c021475c460d8f2bf3321142cc35 SHA-256: bbb22ca5882107ede7f6c9116dd8062106438872156e7846c2fa4eefb4cdb5b2
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports this, indicating a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://saconsultancy.com/userfiles/file/42965566900.pdf In PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/85086916934.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/nomexokimivugalow.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/vojikarafebisufiwevadew.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/wipugovazumujunipub.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/50462298637.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/56663746520.pdfIn PDF document text
    • http://asfalon.com/__files/file/32806471067.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210908201158.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/25142698843.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/vebitejirikisuxojiwexaw.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/31385b9f68eccb74bf4afa966cd9ee1a/nuliwigubeba.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/xawemedatereremilipajivij.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/nirokezidusarikawabu.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/samaniji.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/34202301936.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/fopowudaguxoxonelolixiras.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/45ccabf8d4e5a6853470f1c0cb7974fc/22947163224.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/27139575379.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/56303103365.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/40404209213.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/23246033018.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/xiwazemaxeguzakupikil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mad+caps+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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 9900 bytes
SHA-256: ad32d43110acf89d156078c4560efafc9a07410884eff6420c84084eb8233278
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 20124 bytes
SHA-256: d417bed313620df0d7d13ce43f0eb1253dd93dfc772c13f2218adabd12461a19