Malicious PDF — malware analysis report

Static analysis result for SHA-256 97364ede160ba570…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 22:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eae882ac12e398ba26af016b13728512 SHA-1: 3a1b820ba7e2b3c283191af4e5255420d453259d SHA-256: 97364ede160ba5707d2e10d23d0cb6a61b241c0128d6e2ef2e5ab0780cc738cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to direct users to malicious external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://yeongwonenc.com/userfiles/file/kapisudofevu.pdf In PDF document text
    • http://cityfate.com/files/files/38065518557.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/92616143213.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/fekuxit.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/24140200050.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kamafumixodona.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/donenixi.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/63087152025.pdfIn PDF document text
    • https://t2sc.me/userfiles/jeminedibilozibal.pdfIn PDF document text
    • http://ipceurope.be/assets/file/51997439869.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109211221101267.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/fuvija.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/95913290699.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/11769730163.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/lijafidasawaxukureguluvi.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/gopesuxutidabiwexenex.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/24696407639.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210912133031142091iy3dzv90wngd.pdfIn PDF document text
    • https://birudongker.com/contents/files/70315058217.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/luzet.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339c98a1bc0---32226437465.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/pomuvilinuvon.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/87465894552.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/mudakonev.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/14096013800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+fix+freezing+computerPDF 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_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 17104 bytes
SHA-256: 656a97194acad944fc7834849b79aeb4e6f8077cbbb62e2bd25dc57816984a77
font_02_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 10788 bytes
SHA-256: a96dc59eda4f0618a5fcb2c9f1e07aea038fbe304b4935163f93e66db824aa3c