Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fcf1556145e949…

MALICIOUS

PDF

68.9 KB Created: 2021-09-10 01:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a706a9a1188ebfd4337fdd4794108d71 SHA-1: ee73d2ef9e1bc7168700b2fc5d0f30aae5d214ad SHA-256: e8fcf1556145e949a91af09e4c20a0423c7eee0fd25212900a98848dc97a46f4
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The PDF also contains numerous external URIs pointing to disposable domains, indicating a link farm or redirection service likely used for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=dua+for+parents+protection PDF link annotation
    • http://xsjsbzrw.com/uploads/files/70724089660.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ff8607b1b2df85b9571cfc4242425332/22860296895.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/29f3aca35ddd5cb2ef5ff357f050dbcc/ruginebebexepijawebuwedo.pdfIn PDF document text
    • http://12shio5.com/contents/files/17125019415.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/jikabepabu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/64659640869.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21090821265432871767vlku.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/98810603748.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dijoruvanomarevew.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/76236844786.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/mitovavi.pdfIn PDF document text
    • https://funke.be/data/file/jevowu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/weratelo.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210910034636.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zujazomosutujakimipaw.pdfIn PDF document text
    • http://bubb.cn/up_file/file/xolatajakajaso.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109022038425692.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/movosasoda.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/mibusel.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/pemipebowuzumo.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/71977007589.pdfIn PDF document text
    • http://novichiha.ru/pic/file/fogojij.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_off0000ac47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC47 10528 bytes
SHA-256: 0652dbc2c2707ad9790c76e67dd1b0187ed2af11a14ba4a868661941f1723328
font_01_sfnt_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16600 bytes
SHA-256: ddb5825e6fe27f8c3b04686baac2acafbb9aeb77701f22465499418608f52404
font_02_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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