Malicious PDF — malware analysis report

Static analysis result for SHA-256 759586536b3833d7…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 01:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbafbaa6575071235aa8501b45127143 SHA-1: 8c67b860ea0f9c023798390735e0d407688f58c0 SHA-256: 759586536b3833d7ec29fdd768320eb5f2510981b037bee314fd268f17ee2614
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, including one that explicitly mentions downloading the Play Store on Windows, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to disposable hosting further supports a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://synerhu.ru/uplcv?utm_term=download+play+store+on+windows+10 PDF link annotation
    • https://vrindaindia.com/php/joseph/uploads/file/46583131237.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/71650555499.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/65184664176.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/venuvazobilamubazuzuvupu.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/joremawilenotosusapesimaf.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614040818f91e.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zuzubijipufekilibufixa.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/rowulukugijesebupunibur.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/8942524334.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/siresudonurodudifezufup.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/36500029430.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/k1894q38i3afeh41vu9lgah2l6/32606592420.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/85813785574.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/8296484364.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1804532431e62a73ac6982cf3d3eab09/51695779454.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/46239100637.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/52723502312.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/dotobifoleropil.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/27521247676.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/tubanuruwagenizew.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/45294972906.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/giguvimamekajibugazum.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/29407002558.pdfIn PDF document text
    • 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_off0000b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 17196 bytes
SHA-256: 9fc1517914e9583523b85077a46388f953a856aa9fc2d1cdcda498aca6f3b6df
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10760 bytes
SHA-256: 3afd6ba3a6bb12eb22e1a6e3c5cc8737165eb6713b50df655c93af08865206fc
font_02_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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