Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd732a42b57282d9…

MALICIOUS

PDF

89.1 KB Created: 2021-05-19 06:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5371db4e0bce3a839470a9b0ba90405f SHA-1: 2a2644cb05c2dbcf9d63c2678a900a45602d5b97 SHA-256: cd732a42b57282d9e569aa9a18c1411a949ad31c5aa4a7ca91e41b7b373bfc2a
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a social engineering attack to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=how+to+speak+english+fluently+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369165/normal_601fb20bb6f3d.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/xajetabulebivoguwap.pdfIn PDF document text
    • https://zavelodenewiguj.weebly.com/uploads/1/3/5/3/135314669/90a13b74c82093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380525/normal_5ffe712e53007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498986/normal_6046889c407aa.pdfIn PDF document text
    • https://zazusixalug.weebly.com/uploads/1/3/4/4/134491239/suxigamoxozinom_zemug_simovuguxupuva.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/3445133.pdfIn PDF document text
    • http://belixawotid.66ghz.com/kejisatodivodowe.pdfIn PDF document text
    • http://wefinexof.iblogger.org/42863910219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_5ff32d0b852f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b09f4b7-29b8-4ec9-ab2c-ec73f6e73dbe/el_nombre_de_la_rosa_pelicula_completa_online_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a632ac9-1eda-461e-9128-e9db45134519/87990418118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e96695-68bc-4d33-9fc2-b649a3b97453/redef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e75ddad-6267-4e19-84af-b3422d104b96/the_limiting_equivalent_conductivity_of_nacl_kcl_and_kbr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2431b8a5-9ca9-4e51-9eac-d88ab3966d0a/fexaxidifamaw.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/jukajawobadoveladu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24c4ead-f365-4c78-ab3c-a105229da967/how_to_replace_bearing_on_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/621de8c3-2f4e-4777-8410-39d05ba64749/modern_refrigeration_and_air_conditioning_21st_edition_download.pdfIn PDF document text
    • http://buvumitibeve.rf.gd/tricaster_460_advanced_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222bda85-db82-4332-80b0-679ba67ec71e/midnight_sun_movie_songs_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/wukole.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/24109409858.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
    • 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://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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 6476 bytes
SHA-256: 90fde11a3f0037fc907ae8b61c813580ea22ef209ebde2636d9354b201d9be1f
font_01_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 5568 bytes
SHA-256: 5e1ecc0558ec908a8139644ddfb4e9ec1cc33ab6f12ad684cb7ded759ccb5383
font_02_sfnt_off00011ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 11036 bytes
SHA-256: b8c1defccadcaf738f7f2bd427b03fc4699eb3a6d7ba5fe825a73afa38ada879
font_03_sfnt_off00014082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14082 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b

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