Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ce3ab4bc8dfd76…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 04:50:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ff9b64772f03df28f0fe2383e8204ec SHA-1: d4dceeac67f1b69e3c5cfb5866b55dadbe3309ec SHA-256: b7ce3ab4bc8dfd765b08ebcce688ae3b9c661a38e34e730a4ebfff66d971dead
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/award?keyword=mitologia+griega+y+romana+diferencias PDF link annotation
    • http://dragonflysagewellness.com/visobedaligetosajezanibskn0e.pdfIn PDF document text
    • http://mavpa.fun/b._c._full_formmqrct.pdfIn PDF document text
    • http://vehicleinsusa.com/253372709387wsrq.pdfIn PDF document text
    • http://neojust.ru/off_road_buggy_planscr4zl.pdfIn PDF document text
    • http://portkamesto.site/debiwoqqsho.pdfIn PDF document text
    • http://bossyonlinex.com/now_were_stressed_out_lyricss3thq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_fab426f6896d4ccba05a0b17169096cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/android_canvas_draw_empty_rect.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_3cc784be2b854c429870d7b9dfd9f4c2.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_3b2f6f14e25f40e7935f66a8f4ce6557.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/oxford_dictionary_of_difficult_words.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/badlapur_movie_all_song_ming.pdfIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_38cb438a92414680a8d21ef8d32d7ff4.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_b3b6151e5ee941459396bd04a700a04d.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_9cb4be28108748f19a2cc781f2a93641.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_16b21c57059c493e8e04db8dcb1c32db.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_ac7b18102fde4c86a572f66bb4e897c7.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_4571649e3a054a208ddee7900a43e59a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/ambali_film_song.pdfIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_5589bb8d6ee74186af2b6b271e8f3778.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/default_password_for_xerox_workcentre_3335.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_86a1012fa827433ebc2939239a390f47.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_ddfa0f4a3f4a4e5196dc98ad770497bd.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_ecc64326b6e14874b9929ee88ce26c41.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 5448 bytes
SHA-256: 037a0c290b02252c2c94391346e9329058fe8f2ae2a0ade40f825b94e2371f5a
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 11356 bytes
SHA-256: 658eca028f1e11f47d16da911aa23c1173644068754d55eae0d9e9192164234f

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