Malicious PDF — malware analysis report

Static analysis result for SHA-256 29195ece6adfa62b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-10 15:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fabb511f99ebc487772b29c5ce9ef5a0 SHA-1: fbbcda7c6ba7ba5f7afd07df458e577a653a9d65 SHA-256: 29195ece6adfa62b5afaf13dbf8de28589ef3057844b95a49864f606d7a0b9a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable or unknown domains, suggests a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed for SEO manipulation or to host a large number of links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://csc025.com/userfiles/file/20210901221957_n4pju6.pdf In PDF document text
    • http://saringkarnwood.com/UserFiles/file/kowupiro.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/libotekilezajexopomemaniv.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/fovofokapojotevepasi.pdfIn PDF document text
    • https://expomediainc.com/upload/file/mivekunem.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/706870996.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/najenamagifapigoga.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/komapameve.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-07-00-51-20-3bZ4l2xa.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/sabubagisajizovalup.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/71010287161.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/muvuxurunixuvo.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/66454147543.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/84689807598.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/80710731406.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/98917132562.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/riridakego.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95392238922.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/vibitaxapudonetenadasafi.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lokaxo.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/foguninupuriro.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/tizudop.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/21089152589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=blackmart+old+apkPDF 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 10324 bytes
SHA-256: 394dc9a7bf9b77d693f62fee2362185f2859b5b1200fc2548523ba962016d905
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 16968 bytes
SHA-256: 07b49e50cd55a7ba71459d0105ad8d5f40d4a31b9b2a499bc7a8522fc99003fd

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