Malicious PDF — malware analysis report

Static analysis result for SHA-256 91047e8e9dc6dfe7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 21:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 421c4965fa6a7b6037c6cbbaeb9cc3e7 SHA-1: cbd9262436011be331b569c8ce6b9295b213383e SHA-256: 91047e8e9dc6dfe7fc2170d9dadd47c3e87e2167ad7392e2e1056a5a41360d68
126 Risk Score

Malware Insights

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

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 0.9974

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://alimentosldm.com/userfiles/file/xazitekiviv.pdf In PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904162651476863ifau4xlov54o.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/28000855481.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/82125897279.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/pepidixiwinitajapusufi.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/91195438795.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jukodadafuted.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/63063694717.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210907_86BEA9A4150F4FB5.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/10469109091.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/24483801976.pdfIn PDF document text
    • https://energooptima.hu/upload/File/wavafuvebaxotaw.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/31743648222.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/07/1842908791.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/24660213566.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/vutijimuzumutivugifu.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/76890399581.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/jigonumogupopizilusojogit.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/29879314722.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/42055067159.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/58896735422.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pulijinolepatut.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c4ca0765---34013597047.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/jebubafedaxugopopemoneraj.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/3195039797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rocky+mountain+states+worksheetPDF 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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 18008 bytes
SHA-256: e1c5ae03cd948a1e0e47f94f209e157e44a2714ba8f53289bffd04a3510452e0
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 10888 bytes
SHA-256: 7fd833dff4753b312ff502bbaa09759c581ddec7e1f6a2d84d6eb1b935eb1edc

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