Malicious PDF — malware analysis report

Static analysis result for SHA-256 383c79a7894d7744…

MALICIOUS

PDF

81.4 KB Created: 2021-04-08 08:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 888028328cbc0c968aad290df0d95c25 SHA-1: 00591a32423cdf90e4676cc371525bd6220ea815 SHA-256: 383c79a7894d77445d075b93f92904d53bbf94f01455b4ba485b7ef5a998aefd
186 Risk Score

Malware Insights

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

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 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://baarspo.ru/wix?keyword=vanagon+repair+manual+pdf PDF link annotation
    • https://sewowifef.weebly.com/uploads/1/3/6/0/136082850/wadewemuvugovubo.pdfIn PDF document text
    • https://rulofobu.weebly.com/uploads/1/3/0/8/130814337/cc6b794.pdfIn PDF document text
    • https://bimipesetasezi.weebly.com/uploads/1/3/4/0/134017520/1816749.pdfIn PDF document text
    • http://doxalasi.mywebcommunity.org/plantillas_para_crear_un_plan_de_negocios.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/alman_dili_oyrenmek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekokutiwafodi.epizy.com/beauty_and_the_beast_overture_piano_sheet_music.pdfIn PDF document text
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_8f4625169f0a441d9f4ad836f9950c23.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_4caf40b80e294c1a88f3220b01c64563.pdf?index=trueIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/all_helping_verbs_list.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_154e7d90cc8e40099ddf6e52e77042b3.pdf?index=trueIn PDF document text
    • http://medemamonolusav.rf.gd/76444915547.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_8353d44c3e224a388476199ec9a2d97c.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_f4c152800a314dcd8670cd50d2728504.pdf?index=trueIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_40aef9a84199448db9440634d1d62e41.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_3db06229717e4e379be0fc9f63aa5aaf.pdf?index=trueIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_d5aeec3eaba7409f8240d4f0756780db.pdf?index=trueIn PDF document text
    • http://jolavewavesuj.epizy.com/21041901996.pdfIn PDF document text
    • http://tepobibofa.epizy.com/barayti_at_varyasyon_ng_wika.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_883a7368291a447bb7739bcb0afb6522.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_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 5148 bytes
SHA-256: ac3d3b204f7419c65eb208badb416249c55bb3d3227825c1829f066d49e25e32
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 11032 bytes
SHA-256: 96ae1b4307da9ee33a1da91e7ab5cb972ec993938a80f6bd650d619b665e6392

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