Malicious PDF — malware analysis report

Static analysis result for SHA-256 195e5d792e8dd16d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 15:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 456cbabf57c7902e23dbfe4409d2422e SHA-1: a63cd582b75eeb262774dc765269b234827b82e5 SHA-256: 195e5d792e8dd16d2c9c23ce22449a6ae792c628f85e2bce8e64809467e0dd57
154 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one pointing to a raw IP address, suggesting an attempt to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/71414822868.pdf In PDF document text
    • http://caratow.eu/userfiles/file/mewasomagiduxadag.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/pumizetividixigi.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/wemur.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/50878816728.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/19651356840.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/kegekuziwerelopujunib.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vabewikipexi.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/guwokulibesuzifala.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/jenijadox.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/84976626553.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/dumubodemoz.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_235403.pdfPDF link annotation
    • http://biogenetec.tw/image/files/20210903_232525.pdfIn PDF document text
    • http://knipia.com/userfiles/file/dowapokutijijipuma.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/teselovuxenepidirire.pdfIn PDF document text
    • http://runo34.ru/attachments/file/50109591741.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/6280060622.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/74942542481.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nakad.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/vesigizeta.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/72156394157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tamil+full+movie+free+downloadPDF 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_off0000e036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84D 10464 bytes
SHA-256: 8e601ffa9029e531284a046b0675041f55cba31f0abbc17c147d71f093d7fe90
font_02_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 17980 bytes
SHA-256: 018ad8152d34176cd81ddb3fb9fd2deafa9e1622d1a7e644bf753d72a277a4e1