Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fb8dcb0550cbb7…

MALICIOUS

PDF

96.4 KB Created: 2021-04-01 22:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e21e75d9bddf7d61f6020d15c466d37f SHA-1: ecfefc7c25506c5f620be06ae15ff0dabf15db9d SHA-256: 25fb8dcb0550cbb725a4bf4047714b85cfb7ad183009f916be196cd6cf0b6e30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many of which point to potentially malicious or SEO-farmed content, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a common pattern for distributing phishing lures or second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/123?utm_term=types+of+biasing+of+transistor+pdf PDF link annotation
    • https://cdn.sqhk.co/zujumatatub/ojdggFm/vajav.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hoktZwB/anger_of_stick_3_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/jd5gcGp/chuchel_dantdm_3.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/fZagghe/little_oxford_thesaurus.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/iLifJSB/xero_accounting_software_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_409f1eb5a0c64774ab6bab0a9b6adf39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/35053047882.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/sopabika.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/boxing_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/tefubuxizifirasulo.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/56235256975.pdfIn PDF document text
    • http://tidefos.epizy.com/bumewov.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_914f1142ba9c4ccf816a5d70f735f8b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/bobbin_lace_patterns_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/blowfish_algorithm_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/17861096424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a350c3-dc1d-42c1-8791-af57ecb06d38/que_es_el_lder_autocrtico.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/html_css_editor_download.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_d87a119f82884c79b28bd189a2a7f792.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafe4652-10aa-44f4-8116-d68a47131c91/chronicles_of_darkness_character_sheet.pdfIn PDF document text
    • http://bukinajomo.epizy.com/goodwill_donation_guide_2017.pdfIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_264e7c54ddb540d9892bad76e6ba8841.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/561a1c0a-87da-4c77-9a7f-4d9a604bf216/siwimot.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/lamorarivaso.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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 5368 bytes
SHA-256: b70334199fa7c9ebfe4caa3ad159e91abc7b564191bdba6d656b991a58f7c29a
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 6300 bytes
SHA-256: c4caf660c5e4eed867bd265f78ab804edd47e82bbc5845baca6e4b3e50ce6bcd
font_02_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 12408 bytes
SHA-256: 5c8dbc90ab7bdc3385f584eba67a15066ba9b156e9272b0e70a79496b8c3eabc
font_03_sfnt_off00015e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E9D 16100 bytes
SHA-256: 66085bd33cb55e0ce391350d0a43119f109c2555ce96eb5f7cd622e5178496ec

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