Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a578b021ae57472…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 12:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6b4e0b1fd31410f63b0d368d8296e0a SHA-1: 6340d3fd1a42f2a075e0d2eb2b8555c1c60cce84 SHA-256: 9a578b021ae57472c3d42e03f397d887de19f3f3b6a74d8eed1695a020642fd0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on domains flagged as disposable or suspicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a deliberate attempt to create a network of links, likely to obscure the true malicious destination or to distribute phishing content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cursosadistanciayonline.com/medios/files/18283105712.pdf In PDF document text
    • https://learn-atdi.com/uploads/files/topuxoguf.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///variz.pdfIn PDF document text
    • http://dsraxys.com/uploads/82705725117.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631335715.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/lubamekejagebumuzogorar.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/fumodokar.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/zoxabaguximipil.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/zulapezazinarudewufoza.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/pozatunas.pdfIn PDF document text
    • http://amandamaitland.com/images/file/lesiwibesix.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/geguzaweponetasap.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/51817298924.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/36259071699.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sasixufelafenewil.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/jilolonajeziwinogule.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/4166123953.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/34230568605.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/gawokitivuta.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/97460297336.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/61117376327.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/80677297090.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/40862988413.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/perixomubusoxawuvet.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zagevagusikeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=four+letter+word+that+begins+with+ePDF 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_off0000b017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 15768 bytes
SHA-256: 32e6601aaa29d52db18c67ca7462ad69893cb02bce82653b7bfef10acba14a72
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10832 bytes
SHA-256: 858616c5a8206648651a347edef677bc182781ef75b0a7cbf589e2cfd66832e9

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