Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffcb1ddc5960b74…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 10:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: f5b594f9b6012ed11ee86d69741ddd94 SHA-1: 209c2f00acac2a131848efae18153062285eb21d SHA-256: 4ffcb1ddc5960b74457789cbb31d32a779ce6ca0f521cd78b2880407416d7d35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to exploit vulnerabilities or trick users into downloading further malicious content. The presence of a link farm heuristic further supports its role in distributing unwanted software or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://potlista.com/file/files/rixizazemipivojuzizep.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hfc0rdu7g62k69o121bps8f6ph/63316396274.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/jufopuzizi.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bizawekoxepoberasesegoxid.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/wegakufikituzojap.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97d5c30a---kekonenomakikis.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/wugowufujovog.pdfIn PDF document text
    • http://trieuduong.com/images/Download/89662412760.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/karuwogurivaseramomamo.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/36526800423.pdfIn PDF document text
    • http://393citizen.com/upload/files/24788378486.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/sexujumapipilixusolise.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/17566724076.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/vesigizeta.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/gezejipuxatat.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/mitoj.pdfIn PDF document text
    • http://www.moyekolodin.com/files/luwedodi.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/73586300003.pdfIn PDF document text
    • http://gibisch.com/files/files/butolugusevapik.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912020756620542.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/7682735522.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/tevirasavelugixikur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=spy+phone+app+free+lifetimePDF 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_off0000d48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 17384 bytes
SHA-256: ec163508d7fab3ce146f28d9a95fdf386c8f0be3df66ddc9442010ce9c1fb115
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11906 10644 bytes
SHA-256: efd12b4e41b98a0aea68945db8067a62bf5b59f4778734e65e962eb5c5ea8fdc