Malicious PDF — malware analysis report

Static analysis result for SHA-256 876290d7ded49b1a…

MALICIOUS

PDF

129.0 KB Created: 2021-04-02 21:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3a78c7babfba36ab9c648408bb6563b SHA-1: 9d11d0a00e88ec0665d11a610c72ece73a1c23e7 SHA-256: 876290d7ded49b1ab34360d53f4c2bcb064b31abb9b91ab7b53ba22ee05324e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=mummy%2527s+mask+pathfinder+pdf PDF link annotation
    • http://sesizuxewewax.mygamesonline.org/cisco_linksys_e4200_default_password.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/download_calling_sehmat_free.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/niwozudopo.pdfIn PDF document text
    • http://wefigofozotime.22web.org/kaba_eplex_5000_change_code.pdfIn PDF document text
    • http://sutixekume.22web.org/rasitekikakifinifuduxaw.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/44875986180.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/bohr_atomic_model.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/19930466707.pdfIn PDF document text
    • http://zepawagir.iblogger.org/98857155634.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/contrato_de_alquiler_de_vivienda_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_193add31242f4e6bb96c6a59b334fdfa.pdf?index=trueIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/upakari_spoken_english_book_free_download.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_a3aeb992a2c846d4864acec5f5d52cd2.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_e86a33de2da3462c8d814871bdad72ae.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_24e25756761f4d788c3b9b71720ffc4f.pdf?index=trueIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_51c8ef92942349b0be7c05132224cf34.pdf?index=trueIn PDF document text
    • http://vawapod.rf.gd/46675919292.pdfIn PDF document text
    • http://dupepoge.onlinewebshop.net/asociacion_civil.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 67440 bytes
SHA-256: 3ca4c9c555865f2ae939689a3350d02b6d140dd3a285f089762da246db0be25a
font_01_sfnt_off0001be27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE27 5452 bytes
SHA-256: 0851759a59c0c87a54b5c09e83c1b994802d930be0d8a0a4eea6fea3ef65ae17
font_02_sfnt_off0001d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0A9 10424 bytes
SHA-256: 5dce469b89bc9644dfd7a517df5d342d4738f70efcdca4aac2102a914873ee8b