Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03384e5f933db75…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 02:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7aeff2a524d77c2c8fbfbc2533f16e69 SHA-1: 260d35d63dcab3e6b3bada1587931c28e3ebbbb4 SHA-256: c03384e5f933db7505f5b82226840e3c4f9fddab20a930ccb2649d84cc5d42d7
86 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with a medium-severity heuristic flagging a direct IP address link, indicating a potential redirection to a malicious site. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a deliberate attempt to obscure the final destination through a large number of distinct, disposable domains. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 5

  • 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://www.depomatrial.com/file/raromad.pdf In PDF document text
    • https://theelementrama9.com/userfiles/files/12172664810.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/85434622089.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/9734017976.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a42238b4fb---bagufi.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/jenepalevaxaru.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/juzewabiruf.pdfIn PDF document text
    • http://carbonelite.ru/file/volozef.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jabadosiv.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/52438974685.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/93744999405.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/kedovolefodaba.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210904_025926.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/sopumaloz.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23467586774.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/vodagafodekawame.pdfIn PDF document text
    • http://showdoimovel.com/files/files/21740335279.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/wureruxujenexe.pdfPDF link annotation
    • http://chiangmai-esc.net/user_img/files/xewokalafedomis.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wefedoso.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/46409269626.pdfIn PDF document text
    • https://path.mn/userfiles/files/wotupeguxitupuz.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210912135319.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/99808230692.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jagozif.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/90203855505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gta+iii+cityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 20824 bytes
SHA-256: 01ddf99723e57c5a0dd3fe68b8f16a504040ffc78775dc8ebfa5c6fc188444ba
font_02_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 9708 bytes
SHA-256: 38320b87c06922a97a58338ab0776b0c5059f718af1057dc49fa8171cb773a44