Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fad3518de861972…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 08:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2a627211971f18508ec6732ef097382 SHA-1: 2163119c8cd96fc0f1251c0c26c46455a094fcd5 SHA-256: 3fad3518de8619724ec2e78aa9428be7491a1dde4288d91267aa4b0ca7a2cb59
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, forming a link farm. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious intent or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vitofokisugidutoxovuv.pdf In PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090405502273499.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sozifatideri.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/65447930924.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff721cd166---98830381211.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dolape.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/42722145841.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/saputezinebadozebidaralin.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/47590384723.pdfIn PDF document text
    • http://c-six.it/userfiles/files/borawis.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210913094601.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fegex.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/58201010293.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/02/file/suvewotatimajigo.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/murexewerugesika.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/57061412042.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/pokagafuwu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/29ad73060efa50a789844a51a30884bc/sumesifug.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/44813997610.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/bigiwufawamemasat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+alchemist+book+in+pdfPDF 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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 10980 bytes
SHA-256: 596734296586f203108eba55158fd66b33dcbcef02ce83e3e4bd81227ed3da50
font_01_sfnt_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 18700 bytes
SHA-256: 1702a6ae49aa7d0699ab79927c3ea2f2ed4bc554c4dec0909e576cdf983edfd9
font_02_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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