Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc659cbdfb26d2bd…

MALICIOUS

PDF

115.7 KB Created: 2021-04-17 20:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5190318dd58a66c9cf6a4f5fef190601 SHA-1: 2de67c339ca717c299cef078788c3653ff22ae12 SHA-256: dc659cbdfb26d2bd5e322bfbe56a8e17e3781449e7fbe5dbce2bff7169040237
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and external links are consistent with techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vilenefex.ru/strik?utm_term=electricity+and+magnetism+k+k+tewari+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/soziwariru/jhdUJib/67017360750.pdfIn PDF document text
    • https://kibepujuvug.weebly.com/uploads/1/3/4/6/134644113/wafaxovog.pdfIn PDF document text
    • http://vixemifojetinag.sportsontheweb.net/28880574072.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/lie49jh/shankara_telugu_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/BGjbdOw/apple_music_player_equalizer.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jdFgnhc/lodigorure.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/what_is_the_best_gas_for_wire_feed_welding.pdfIn PDF document text
    • https://bavifevip.weebly.com/uploads/1/3/6/0/136049805/6702895.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/gdXhcj1/86999773272.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/Lvie7Y6/luladewotu.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/hh7rjfK/prehistoria_definicion_en_ingles.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/gojitil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_b647518ba3464cf29f0e183f97ec44ce.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_9b066af97edd4cd48a809b8e21857992.pdf?index=trueIn PDF document text
    • https://7ce190f9-fb8d-496c-a51a-ce151dcc024a.filesusr.com/ugd/e72def_e35c03065a774dfe9ce629634b42e43b.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_7d603b339bb04a579ea54d8f8598c0e8.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_e4fa28401a9949ecabd7ebec0ece40a6.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_7bb2286f5377496db47acaf27e5bc838.pdf?index=trueIn PDF document text
    • http://rodisasedozax.myartsonline.com/nys_court_officer_test_questions.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/gutiximirof.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_c5934ea74c0a46efa4a905cabd35b19a.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_bd4d57a740484502b8e251315610e986.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_95a770effb7e4e16abae6845284fbaf7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F6 5688 bytes
SHA-256: 8f4e2ad05af7d3d908a40831ae2bee20415464e9850ff9bb06324bd792786041
font_01_sfnt_off00016964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16964 14852 bytes
SHA-256: 651f68dbd4b1ca7b1548acf5359758a78d11bffd61bfe088311013893247f771
font_02_sfnt_off00019a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A8B 16588 bytes
SHA-256: 60adbe941f80b7395f0d8c9d6e1cc23beb5fb64beaefd73c2002691092f4e9c1
font_03_sfnt_off0001b170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B170 6068 bytes
SHA-256: 094f27fbd8c9468a015f77b5051caeec488f8ddad7677a28e89583a0ce0e0210

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