Malicious PDF — malware analysis report

Static analysis result for SHA-256 143d258b280d7a5a…

MALICIOUS

PDF

90.3 KB Created: 2021-04-03 03:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 783b7dea48376bc825dad456a6dfa44e SHA-1: d481331b6201d81974eaf85c187ccdc729c7138e SHA-256: 143d258b280d7a5a79476c320243edc175163929706ec642f2af1c6d12037fa0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body's misleading title, 'Progressive voters guide tacoma', is used to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/wix?keyword=progressive+voters+guide+tacoma PDF link annotation
    • http://tamodemuror.getenjoyment.net/89319253202.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/11358759544.pdfIn PDF document text
    • http://testrun.ru/discrete_mathematical_structures_for_computer_science_kolman37o6e.pdfIn PDF document text
    • http://testrun.ru/casio_g_shock_rangeman_gpr_b1000_pricer9g2a.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/bimijonememixenabew.pdfIn PDF document text
    • http://kobodesuwid.getenjoyment.net/33257180761.pdfIn PDF document text
    • http://stebsmeh.space/mount_error115_operation_now_in_progress_rhel_7s2mhm.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/dewazarufojekuvisejudimo.pdfIn PDF document text
    • http://mosquito.codes/rofedafarinelokulisipat1sztm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_2bbfb0e015884abba6bfeab2e9cfc123.pdf?index=trueIn PDF document text
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_2edae21fb14940878adaddae0a40ffdc.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_eaff51dc4ef24dce84f52ff67f0daa74.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/40587013622.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_5cb3bd98327548fa8a554c8feae468fe.pdf?index=trueIn PDF document text
    • http://tameladizikep.atwebpages.com/nunotaxani.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_e0104d61cefe459bb90055c55b1581af.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_60b25ca36649422ea3a39ee6cf5499f4.pdf?index=trueIn PDF document text
    • https://ddc7b23b-31e5-4b5c-aaad-d3b7cef26861.filesusr.com/ugd/e506b8_c62c742f51b24c88b8a4059686b00cb2.pdf?index=trueIn PDF document text
    • https://5c51e3d7-2896-491e-a255-1b002e356b93.filesusr.com/ugd/5b6ce5_2deaceaac1644595a791e43c7612f816.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_791909b09c004c4caf74d5d8a214f044.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_b732fe4c04c54a8e9ef1a01ddd818952.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/black_and_decker_8_cup_food_processor_fp4150bc.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_fc71d3390d464f968775cc1d3e10e50a.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001417f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1417F 17404 bytes
SHA-256: e756fc777401b01969be97bb4f966ee88ab61e21ad656233ffb64192b8626067
font_00_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 5288 bytes
SHA-256: db33c49bc85ec1fb7de8a3325d35da45e3f9a57b2d76cf7a0129fb65c893c547
font_01_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 11344 bytes
SHA-256: 7f841a9e08aa3076cb4f9f55b514c9d365e01c65f3278c3e193900975c0ee64b

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