Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd108d3bc77613a5…

MALICIOUS

PDF

89.5 KB Created: 2021-09-13 12:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ade3c7b8807e7e5283ed94bd69ee257 SHA-1: 76e2fa5309b3d2138e437c58f139b5a7f8856d5f SHA-256: cd108d3bc77613a5fa594b85573089c86d0d0913b6fb0065ef61851e5f0a350f
146 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cngwalk.com/fckeditor/userfiles/image/kodojuvonelusipekabaro.pdf In PDF document text
    • https://signatureshreyas.in/userfiles/file/vuguwezilijereburimik.pdfIn PDF document text
    • http://szcftz.com/upload/xefusotuliribumitasojimo.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/67825957189.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/midipotedaziritotiwimejuj.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/53457697506.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/rebebepokonafiro.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/89229502065.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210907_073317.pdfPDF link annotation
    • http://zoldjogsi.hu/uploads/files/77914220308.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/50999865106.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/91604728102.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/xuluginunatuzawenuwami.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109111201121325.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887b90fbbd---bikolozelojowav.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gafolojivarewumujebamuka.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/10000663874.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/28359321464.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/90681934472.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/60297541984.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/samofepaj.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/xezugipolilasesawere.pdfIn PDF document text
    • http://beta-rc.com/upload/files/riraziwupuki.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c547f62b48---pozetipezipives.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=secrets+of+the+millionaire+mind+bangla+pdf+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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 11368 bytes
SHA-256: 7989c2a4b25e274e1aae2f2d6a83ae947591385029f306d56ef08c60d2d66142
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 18676 bytes
SHA-256: 220dd65cf1f5688c3b660eebaba1a5ad23c752228f0be07c183389c4bf58c8e1