Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8d67414605abd7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 06:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59dbee9a9a691c3710af82c58a336d5c SHA-1: 2fae86b6d585ed6ecde8755dadbe2573834c8db9 SHA-256: cd8d67414605abd7660ea613ff80d56b14aaae0b0b8b0c04e41781073c22ebbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, likely to distribute unwanted software or lead users to phishing sites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=indonesia+bus+simulator+mod+apk', reinforce this by pointing to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=indonesia+bus+simulator+mod+apk PDF link annotation
    • https://coffotea.com/uploads/files/202109081417266303.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/pifagin.pdfIn PDF document text
    • http://itena.si/uporabnik/file/riritarewuzefejirew.pdfIn PDF document text
    • https://network-italia.com/file/64565860639.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/setobuvufu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/depukafivule.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/josikorusabebi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/89561630117.pdfIn PDF document text
    • http://sin-hua.org/userfiles/selonojo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_016BDEA936BA52A8.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/96089283126.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/bavezepusekopa.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bbe52394---jodufojomanutojibos.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/69162473476.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/38001432455.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/tokidajifu.pdfIn PDF document text
    • http://parateam.cz/file/fexegoxoj.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/95104374370.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/88830925322.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/kijupasikozowap.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/daloriwidezu.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xasite.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/defaxok.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/38065984483.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/pexasirigomovul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 10836 bytes
SHA-256: b2b3eebcccf2c94b34dfaf6e1fdfede268ae0944a6b170cd556f5955af690206
font_01_sfnt_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
SHA-256: d04de0c5979af59d53ae0e28a8239c309861ffe434b4580597fe6f3e4848954c
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 17620 bytes
SHA-256: c60f5aa9105210d23756ccf510a770d540008095c2affde3a1e4c4d781fbf4e6
font_03_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1